Pros Runs quieter than expected
Cons The card is shockingly large, be sure you have the room in your case first! Also, I had some driver issues with older games (i.e. Far Cry)
Summary I've been hearing from some pretty angry early adopters of the other cards in the 8800 line (GTX, GTS) because this card has a performance / price ratio that I wouldn't have expected until at least summer 2008. It competes at just a hair under the GTX (sometimes besting it, though not often) and blows the GTS out of the water. Install was a snap in my Gateway, but the card is a behemoth, and it is a tight fit... due diligence in measuring your case first is recommended. I highly recommend the super-clocked version... the price difference is worth it. It came with Quake Enemy Territory, I didn't really care about that but the game is a good time nonetheless.
I don't have SLI capabilities (yet) but if you are looking for a pair of cards to rock any game out there, look no further.
Disclaimer: I have very little experience with ATI's newest cards, I haven't cared to check them out, I did shop heavily in the 8800 segment of nVidia and this is the best of the series. Plus you can hardly go wrong with nVidia.