I purchased this game and I'm pleasantly surprised. The Graphics own the Ps2 version and the PC version on full blast PC hardware. I suggest anybody who has an Xbox, loved the Ps2 GTA games, and hasn't played the Ps2 version in the last 6-9 months buy this game. Below is a graphics comparison I found at Gamefaqs.
http://web.acd.ccac.edu/~msimm29/vicecitycompare/
I have played all of the versions on Ps2 and PC, and there are many more differences. The changes are all small. But there are so many changes that it makes the older versions feel unplayable imo.