Pros: *Size is better than I thought (my opinion I guess, others claim too big) *No Fans (Really! no fans, all convection cooling) *Lots of different connections (Firewire/USB/eSata) *Good packaging (is that a pro?) *Can do "hardware" mirror (no WD software needed on final install) *Takes 12V DC at 3A using normal barrel DC connector (So you could replace adapter easily) *Contrary to other reviews the RAID function DOES work (once set via USB using WD software) on eSata with no additional software needed once set.

Cons: *No eSata Cable included in box (I got those wonderful eSata SIIG cables from newegg anyway...get them...really...get them) *eSata Speed != drives speeds (Tests show I BARELY get 40MB/s with the WD unit on eSata. I have done at least 60MB/s with this eSata card so I know it can do at least that) *Has trouble switching between USB/Firewire and eSata connections (Detection) *Wall Wart AC Adapter is HUGE...not kidding...very long...really strange *Manual claims that IF there is ever a drive failure (not sure without the WD software how I would find it but...) that after replacing the failed drive the unit will DISCONNECT itself from ALL PCs until the FULL clone of the array is done. This means you may NOT use the unit while it is rebuilding. Really odd but I can live with it

Overall Review: OK, I just got this today and after reading reviews the first thing I did was: 1. Get junk PC (win7 x64) to run WD software on 2. plugged in the unit via USB 3. Switched RAID mode to RAID 1 (Mirror) 4. Attempt to upgrade firmware (received error which looks like the firmware is already the latest version) 5. Unplugged USB and plugged in eSata 6. Fiddle.... At the first the drive didn't really want to detect consistently. Looks like you cannot really just unplug the connections and go straight to or from eSata. I have to do a do a full power cycle (on the drive) to do have the drive correctly find the startup command being sent by my eSata card. Also I have found that the drive instantly disappears if I try to do NTFS formatting with large block sizes (like 4k). Defaults sizes seems fine. This is for my OSX SL Mac Pro (2009 8-core) so I went ahead and placed it there on a Sonnet Tech PCIe card. Detected perfectly, so far it's copying my old TM drive with no hiccu

Pros: These units can take a LOT of load. It is true that the software is poor but I run their Linux software and while that is kind of poor it at least is able to alert you and show battery condition/load along with a log of events.

Cons: I have two of these units (bought about 3 months apart. Oldest one is still working fine through MANY outages, voltage dips, spikes, and brownouts. My newer one just had a quick power loss and it went "POP", PSU smell (you all know what I mean there). Unit still provided power but LEDs on front were dead, power button was dead, unit made an odd fan rattling noise when on battery only (not when on AC). Breaker on the unit NOT thrown. Bought it 11/06/2006.

Overall Review: I am trying to RMA it with Opti-UPS. However they do demands an original invoice...Newegg does not really do that so I'll send a printed invoice. I kept the box (only one for the two UPSes it just happens to be the right one for this unit). The printed invoice has the same name on the box that is also on the RMA so let's hope that is enough to prove ownership. Overall I only choose this one for the high AMPs and standard batteries. I would gladly go with APC if I felt I could actually get replacement cells without having to pay enough to buy the UPS over again. I will have to buy another UPS in the meantime...and I think I'll steer clear of any more of these units and just use up my old one, RMA this one, and not buy any more Opti-UPS branded supplies as it seems I got my money's worth (compared to others) but in order to take this unit out of operation I had to shutdown things all the way down...my money and time are worth enough now where I should just pay for better up-time.

Pros: * All drives worked * 3 year warranties confirmed on Seagate.com

Cons: I had an issue with these drives in an Areca ARC-5080 desktop RAID Enclosure. After running the newest controller firmware (1.52) these drives throw a "Time Out Error" but don't drop from the array. Rumors claim that Areca controllers don't like Seagates with Spread Spectrum Clocking (SSC). I couldn't find way to control that, but I found that if I tell the controller to run all Seagate drives at SATA II (3G) speeds, no more errors! NCQ settings didn't help. I don't really care that the drives are running at that speed because they cannot go fast enough to saturate the links they are on, since each drive directly connects to the controller, if the setup had a multiplier in it then I'd care. With a mechanical drive it's never going to even top SATA 1.5 speeds anyway (per drive). I'm not using more than 1 lane per link so link speeds don't need to be faster then the drive anyway.

Overall Review: These are Seagate's NAS/DVR drives to compete with WD Reds. However they still carry the same warranty as Reds (3 years) seems like if they wanted to get more loyal buyers their put 4 or 5 years on them instead. Otherwise these gave me more trouble then brand new 4TB Reds, I only bought them because NewEgg wouldn't let me buy more Reds on holiday deals after the 5 unit limit.

Pros: * They are suppose to work properly with advanced hardware RAID functions (TLER). * Lots of good Holiday deals for these WD Red Models. * All 5 of mine worked! * All 5 running in a desktop Areca ARC-5080 enclosure (FW 1.52) with no modification of settings required (unlike my two Seagate drives). * Speed seems fine to me. * Warranties on all drives confirmed for 3 years. * Each drive came with a fun WD RED sticker! Stickers are fun...

Cons: * Newegg wouldn't let me order more drives :-) * Like everyone today these drives only carry a 3 year warranty..considering they are designed for NAS usage I don't see why you wouldn't have 5 years, but you have to get enterprise drives for that (which cost at least double for 4TB densities right now).

Overall Review: I was on the edge about purchasing these since they are extremely negative and positive reviews in the feedback section so I ordered the holiday deal limit and was expecting a couple DOAs. But they all worked! I let them warm up to room temperature first before I used them. 4TB is very huge for me (I only need about 4TB total!) so I planned to use 5 drives in a RAID 6 with several hot spares. This allows me to simply swap out a drive for any RMA or whatever without having to wipe it first and hopefully I have enough redundancy plus external backup to keep me in good stead for at least the warranted 3 years. Make sure you have a UPS with your RAID arrays, seriously!

Pros: *Got it on a great New Egg Deal *Seems to operate at the max of the PCI-E 1.0 slot the Msata -> PCIe adapter from MacSales can function (which is about 250MB/s-300MB/s *Firmware is produced for these Msata M4 units but this one already had the latest on it *No hickups so far

Cons: *Longevity is always an unknown

Pros: *Finally we get a working option to upgrade without firmware hacks *Takes up less space then the ATI 4870 it replaced *Quieter than the card it replaced! *Has more connection options then the card it replaced *Mac Pro booted into 10.8.4 no problem after insertion *Comes with gold membership on Sapphire support site *Comes with two special 6-pin PCI-E power cables that fit the Mac Pro (I already had these same cables from the original card and so I used the existing cables, which appeared to be exactly the same) *The card's manual claims this card supports 4K resolutions on DisplayPort and HDMI connectors! *Since it has 4K support hopefully when any new Cinema displays are released, this will work!

Cons: *It doesn't correctly have a full length bracket and so the the back of the card isn't supported inside the computer *Doesn't have a metal core to support the card *The card has four metal bolts supporting the heat sink's back at the right height to be inserted into the slot while it's laying on it's side, those bolts seem like they would scratch the inside of the case as you push in the card. *OSX 10.8.4 started the first booted with a scaled display, this was not very readable and I had to manually set the resolution back (not the biggest deal). *Has a select-able firmware mode switch, check that the switch is correct from the factory before installation.

Overall Review: I've had the original card in the machine since I purchased it in 2009. I'm not really a gamer however the original card ran extremely hot, had artifact issues with some of the display port adapters and generally had a loud fan. This may cost a little more and not be the latest tech, but I wanted to drop-in replacement that I could still boot to the Mac's PROM or option screens. This was certainly cheaper then any replacement card sold by Apple. Mac Pro Specs: 2009 Model Dual Procs (Quad Cores) 2.26Ghz 96GB RAM 10TB hard drive space 512GB OWC PCI-E SSD Sonnet tech ESata 6G External SATA Card ATI Sapphire 7950 Gfx 3GB