Summary: I bought one of these a couple months ago to add space to my Windows 7 home server. After extensive tests it's now in my DrivePool and working just fine. I just bought another to replace a couple of 2 TB WD Green drives with 1.3 million unload cycles... I figure it's better to catch these before they die. This drive also passed extensive tests (SeaTools short, long, and low level format).
Excerpt: These were to replace some WD Red drives (from another vendor) which, contrary to their description, were "bulk" drives not subject to warranty. I had no problems registering the drives purchased through B&H with Seagate. The fit into the intended RAID enclosure without problem and were formatted and tested flawlessly. The drives arrived on time and well packed. The drives are quiet in the RAID enclosure.
Summary: So far so good. I usually buy WD but this one had great reviews and the price was right. What else can I say. It is working fine in a OWC dual drive bay via Firewire 800 to a 2010 Mac Pro. No issues!
Summary: I am only giving this three stars initially because it's new and, as with so many things, its real value will only be determined over the long haul (I'm quite tired of replacing failed drives). I spent a little more on this model because it supposedly is designed specifically for use in NAS (like my iomega ix2-200). Hopefully this means it will last longer in a higher-vibration environment (two of them mounted side by side). Time will tell.
Summary: I purchased two of these drives back in June 2013 for a QNAP NAS device in a mirrored setting which appeared to work just fine once installed. However, a few days ago, one of the two drives started going bad with 4 bad blocks. So after about 1.5 years, I have to purchase another set of drives. I would not recommend buying these drives without the two year warranty attached... these drives don't last too long.
Summary: I have been running these drives for about 6 months now without any issues. I set them up in a RAID 1 array and achieve 100MB/s over my network. I will never understand why people use non-NAS drives and in NAS arrays and wonder why they have failures.
Summary: This was an Emergency replacement for a Seagate failed drive in their BlackAmour NAS. Beware, Seagate factory packaged NAS's have no NAS rated drives in them. I have now replaced the other 3 drives in this NAS with 3 more of these NAS drives. And yes, you are taking chances running non-NAS drives in an NAS application. Shame on Segate for doing just that from the factory.