Multiplayer works over Kali, Heat.net, Mplayer, and probably just good ole MS DirectPlay for IPX gaming, and it's a blast as well. There is even a combat mode, which isn't quite as developed as it should be, but it's still fun. Lag's okay, and seems best on Kali with a good server. If you've got a 300 or under ping, you should be fine. Nope so the sound is almost as fun as the game.
Performance is great, amazingly adaptive, and thoroughly refreshing.
It's dynamic engine, incredibly cool tracks, and killer soundtrack make it my favorite of a slew of racing games on the market, especially in the originality category. I dont really care if we're off road or post-apocalyptic, what I'm happy and loving is the simple desire expressed to make a racing game that defied its own limitations.