I own every XG game (1 and 2 on N64, XGIII on PS2, and XGRA on XBOX) and I don't feel that XG is as good, or as fast as WipEout HD. As a collector of the scifi racing genre (I have it all trust me) I really feel that WipEout HD is exceptional. To me it feels like playing WipEout 3 (or even XL) and I can't complain about that.