I have that computer, and I love it. It plays everything I've tried so far. The game with the lowest frame rate was Neverwinter Nights 2 (still runs at 20-30 fps @ 1920x1200 with everything maxed), and I think that is because that is a CPU intensive vs. GPU intensive game (so I've read on the NWN2 forums). I had to download newer nVidia drivers and make sure I turned on the SLI, but once I did that it worked great. I bought it last Sept., so I would assume you would get the latest drivers now, but I'd still check if you go that route. Expect to use it plugged in most of the time though, as the battery only lasts about 1-1.5 hours depending on what you're doing.
I'm looking into building my own desktop now, but I do still love my laptop.