Pros: Very fast for a HDD, faster than my first SSD. roughly $50/TB.
Heavy, very heavy, even compared to my WD 1TB SE Datacenter drive- Dead Rising should add this drive as a weapon option.
At the company I used to work for, we only used WD drives (whichever color was appropriate) to build Office PCs, a few gaming computers and quite a few Component Racks and NAS systems for Office and surveillance use. We had one 6TB Red DOA and no other issues, out of the at least 90 we bought. I'm pretty confident in WD.
Mine is whisper quiet... or less. I don't hear it at all. I had my wall off last night and even listened for it while it was transferring @ 150 MB/S, from a WD SE (The SE was slowing down the transfer, it tests at 160ish). Speedfan reads the temp at a steady 73.4 @ idle.

Cons: Not a one.

Other Thoughts: Most of the poor reviews for these hard drives are probably related to shipping damage. Quite a few of them are also individuals leaving multiple reviews. I only found 2 or 3 reviews with legitimate complaints - I don't consider DOA a legit complaint (except for the guy who says WD told him it was an invalid serial number). DOA is rare, but guaranteed to happen occasionally.

Pros: I've barely turned up my system since getting this and mostly turned the sub down to about 60% gain and it provides substantial bass. I watched a BluRay yesterday, Jurassic Park III. The improvement this unit makes over the old one is significant.
5 Year Warranty, with Klipsch, who I know to be a very good company to work with-
Lightweight with a sturdy feel.
Outperforms my SW-110, without being broken-in at all- It's Only gonna get better over the next few months.
Regular 2-pin power plug, instead of PC plug.
Listening to some Beethoven right now, had to turn the sub way down, but every now and then, a certain note hits and the sub brings the whole thing to life.

Cons: Not really a fan of the LED, but if it did matter, some nail polish would fix it.
Big Subwoofers seem to get a lot of flack from people who are probably using them incorrectly. It took me a lot of effort to get my first sub to sound "musical" and even (mostly) knowing what I was doing, it took me a few hours to get this one sounding right.

Other Thoughts: Weighs less than my Klipsch 10" sub, but it doesn't feel flimsy at all... I wouldn't sit on it, and I have stood on some Klipsch subs before.
I've had this for about a day, if it doesn't get any better, I'll still be happy. If it breaks, I'll update.
Subwoofers don't need to go to 250 Hz, so if you're concerned about losing that frequency, don't be (I read reviews and questions on similar subs, suggesting that were a bad thing-some cheaper 10" subs go up to 250Hz, FYI).