Pros: - Potentially good Linux support - Button to turn off chirping - Simple, useful display that is not always on - Great customer support

Cons: - Questionable reliability (see below). Perhaps there are issues with the design of the pure sine wave version of the UPS as opposed to the step function version.

Overall Review: My first unit failed shortly after I started using it. Basically I came home to find my workstation off and UPS smelling a bit like burnt plastic (though not as bad as some people have described here). Load was about 300-400W, well below what this UPS was designed for. As per the manual I unplugged the UPS from the wall and unplugged everything from the UPS, but when I plugged it back in it sparked. After writing a review here, Schneider Electric contacted me with instructions on how to contact them and arrange for a replacement. After a few minutes on-line with a support specialist we had a replacement arranged, and a couple days later I received a new unit and a pre-paid return shipping label (I was able to use the box to ship the unit back to APC). So far the replacement unit has performed well, and I was impressed at how quick and easy exchanging the units was.

Pros: It's fast.

Cons: Not reliable == junk

Overall Review: I started having problems shortly after purchasing the SN850. Basically, it doesn't reliably with lower power states. I purchased a gen4 x4 NVMe from a competing brand and that one seems to work fine. The SN850 will will train at gen4 upon boot but may fail to retrain after suspend/resume. This caused errors in my root filesystem but thankfully I was able to recover. I ended up putting this SSD in an older system with gen2 only and it works OK so far. I won't trust it for anything important.

Pros: - You may gain the distinction of mounting your drive using velcro and/or tape. - You might get to utilize some of those empty 5.25" drive bays.

Cons: - Unreliable - May require a firmware update to mitigate noise. (see "other" below) - Only has two screw holes (front and back, no middle). Likely will not fit into tool-less drive bays that come in many desktop chassis since they usually utilize front and middle holes. - I took my drive to a local computer shop and tried about a dozen cases from Antec, Corsair, NZXT, and other popular brands and the drive did not mount securely into their 3.5" bays (the bays utilize middle holes). - Common 3.5" to 5.25" mounting brackets do not work either since most of them use the middle holes. - Mounting with velcro and/or tape might not dampen vibration enough which in turn may degrade performance.

Overall Review: [Update 3] The replacement drives Seagate sent have been working fine after several months - Bumped the rating up. [Update 2] I RMA'd my dead drive and Seagate sent a replacement. No hassles, thankfully. Things got off to a rocky start with these drives, hopefully Seagate will make things right with other customers who experience failures or other issues and have improved newer versions of the drive. +1 egg. [Update] I ordered two of these and now one is dead after about 14 months. I filed a support ticket with Seagate and they basically told me that I'm out of luck since I can't run their Windows-based diagnostic utility (I run Linux). I sent them output from smartctl showing SAT command failures but they refused to work with that. I don't expect them to support everything but it would be nice if they showed at least some competency with standard, open-source tools that a lot of enterprises use. For mounting into a 5.25" bay, iStarUSA RP-HDD35V2 brackets worked: https://www.newegg.com/Product/Product.aspx?Item=N82E16816215435&ignorebbr=1 For noise and firmware: My drives came with SC60 firmware and according to the internet SC61 is the newest revision that helps solve the noise issue. Fortunately there is a Linux tool (seaflashlin) for 32 and 64-bit systems, but unfortunately I had to obtain the SC61 firmware from a third-party website since Seagate's website didn't have it listed for my two drives' serial numbers (The FW I found claims to be compatible with Iron Wolf and NAS drives with FW version SC60). Hopefully I'll see an explicitly supported FW version from Seagate, but until then SC61 *seems* to work and makes the noise tolerable. I added +1 egg to my original rating since with the special mounting brackets and FW update this drive seems to work, albeit with a fair bit of effort on the customer's part (it's not totally defective at least).

Pros: - Works as advertised - Comes with plenty of screws (12 IIRC) for mounting the HDD into the bracket and the bracket into the 5.25" bay.

Cons: - A little pricey, but fits a niche.