I got mine yesterday and installed it. I'm running Vista, and the drivers SUCK, so I dunno that I can make a legitimate comparison over my old 7800GT just yet, but SupComm does seem to be a lot faster with multiple units on the screen. WoW has this horrible problem where the framerate drops to like 5 when you turn sometimes, which sucks, but again, has to be drivers, since it never happened to me with the 7800GT with the same settings.
I think it's a solid upgrade and the price is the best yet, but until Nvidia gets their stuff together when it comes to driver support for their 8800 series cards, I can't exactly recommend it to anyone, especially if you run Vista. By the time they fix the driver issues, the card will probably be $40-$50 cheaper at least.