Love love love 2097, as Jimbo says, was really just an evolution of the first game, but everything was just that bit better; weapons, track design, music, so on. Still holding out for it on Playstation store, but I think there may some music licensing issues or some such.
As for the N64 game, it was actually essentially the same game with totally different tracks, so if you're a fan it's well worth checking out.
:wub: