I have it. We play sometimes MP, I tell here next time we play. Usually there are only 3 players on our tournaments, would be nice to have more.
It reminds Crashday. However it lacks stunt modes and damage model is simpler. Personaly I prefer GG over Crashday. Handling is very arcade, ''unique humour'' is very poor (f-f-fun puns like Jed.I.Knight as opponent name), weapons have feel of power, car selection includes many rarer cars on game like that (Reliant Robin,Fiat Abarth) aswell traditional Muscle and Sport cars, tracks are closed (indestructible fences on both sides of the road) but have multiple routes. It's fun game, not best ever, but fun, buy it if you can. It's now sale on Steam, just 7,81€ + 1,69€ DLC.
It seem to be a fun game
DLC Full Metal Zombie review