Pros: I installed two 1TB Crucial B100 SSDs in RAID0 to give me 2TB of space. The card worked well.

Cons: The instructions are missing a few things. First you should boot into Windows with the new device installed but using your old drive to boot up. Then download and install the driver from their site. Then you will need to press ctrl-m to access the cards BIOS and setup the RAID0. By default it is JBOD, not RAID0 or RAID1. Then you can clone it over.

Other Thoughts: The speed I measured with CrystalDiskMark maxed out at 370MB/s. Perhaps some faster SSDs would have done better but it was far short of the 800MB/s advertized. However, the computer is still snappy and feels fast plus it is about $2,000 cheaper this way than buying a 2TB SSD.

Pros: Installed in my 2009 & 2010 8 core Mac Pros. Simply flawless running two Silicon Power 240gb SSD in Raid 0 and two Samsung 240gb 840's in the 2010 Raid 0 as well. No issues and screamingly fast. Also bought the Single SSD version to add a third 480gb Mushkin for audio samples. So far, almost a year, and not a hiccup. Way cheaper than upgrading to a 2013 Mac Pro and comparable performance now. Think I'll get a couple more just to keep on hand in case they discontinue them.

Cons: They're not free.

Pros: Dual SSD single card. Works on older computers. I have a Dell T7400 works like charm. Trim support works for using it in non raid mode.

Cons: Documentation is poor and support forms there are not a lot of information on it. The card said it supports trim for raid but when I tried it using windows 8.1 it showed the drive as a hard disk. So I use the card without raid and the drives show as 2 ssd ant windows 8.1 trim works great.

Other Thoughts: Over all a great card gives my old Dell the option to run ssd and have Trim support. I would recommend this card to any one with old pc.

Pros: Works perfectly with my 2012 Mac Pro.

Preserves the all-important Mac Option Screen.

Dual boots Mac Yosemite and Windows 8.1.

SATA 3 Crucial M500 960GB speeds are very close to those on a 2012 mini with its native SATA3 bus.

Cons: Almost none. If running two SSDs in RAID 0 one could ask for a little more bandwidth but that would not stop me from using the Vel-Duo with RAID 0.

Other Thoughts: The users at the MacRumors Mac Pro forum have been writing about the Vel-Duo for some time. I finally took the plunge and am very impressed with the hardware and its performance. It is the perfect addition to a 2010-2012 Mac Pro Tower. I already had two Crucial M500 SSDs so the Vel-Duo is an extremely cost-effective way of get faster boot disk speeds while freeing up the Mac Pro's SATA 2 ports for other hard drives.

Pros: Works fine in my Mac Pro 2010 with no issues. I have 2 Crucial 500Gb SSD's in a hardware RAID 0 array. Blackmagic disk speed test returns about 650MB/s read or write. Not as fast as claimed but still speedier than a single SSD on a built in SATA-2 port.

Cons: Not as fast as claimed but still speedier than a single SSD attached to a native SATA-2 port. To set up hardware RAID you must first install the card in a real PC and enter the card's BIOS at boot time, set up your array and save your config. Then install the card in your Mac Pro. Could use a Mac utility to make this easier.

Other Thoughts: Time will tell how durable this setup is but it seems ok after 3 months.