Pros: amazing cooling, pretty good fan
Cons: Height is a bit of an issue in some cases, barely snugged it into an Antec 900.
Picked one up from Micro Center nearly 2 years ago for $14 on sale. Little did I know that this was going to be the best tech related purchase I had ever made. Paired it along side a 955 @ 3.8ghz, kept my idle temps at 27c, and never seen it hit over 50c when under full load. You seriously can't go wrong with this thing. 
Only complaints is the height. It barely cleared in my Antec 900 and just would fit into my NZXT H2 (due to the padded side panels). Make sure to measure the interior of your case, take into fact if you have sound proofing material. The included thermal grease isn't the best, but it will do. I eventually exchanged it for arctic silver paste and saw a 2c average drop in temp. Again, nothing huge, so the stock grease will do.
Only complaints is the height. It barely cleared in my Antec 900 and just would fit into my NZXT H2 (due to the padded side panels). Make sure to measure the interior of your case, take into fact if you have sound proofing material. The included thermal grease isn't the best, but it will do. I eventually exchanged it for arctic silver paste and saw a 2c average drop in temp. Again, nothing huge, so the stock grease will do.
I'd add a complaint of fan noise. It might be a defect in mine, but it's louder than all of the 7 case fans in my full atx tower. I have to use speedfan to put it below 60% so it quiets down.