Summary: This is/was a good card for the money, but it's easily the largest video card I've ever seen (11" in length) and I had to buy a new conputer case to fit it. It took a LONG time to find a case that it really would fit in. Most cards are just 9" in length and would not give you this issue. I'd recommend not picking this one.
Summary: Performance is great, I use it for mostly for 3d gaming and design. It is very long, but fits in my atx midtower just fine. It runs a bit hot, but if you have a descent ventilated case, it should work fine. I own a nzxt hush case and it runs a bit hot because the ventilation for the case is not all that great. I plan on buying a nzxt tempest and running two of these suckers on sli. FYI, the card usually runs on ~100W on idle and ~230W on high load.