The price is the downside. Having to purchase tracks and cars is also very expensive. It's a hobby, but it is still much much cheaper than racing in real life, which I always wanted to do. I got out of the rookie series in road and oval in a day. Now I'm running legends cars mostly with a little mx5 road course action here and there.
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And about the bumps, I've always played those nascar games. The bumps the throw in there are garbage. Right now the only big oval I have is charlotte and there is a slight dip if you arch it into turn 1 that I never felt in a game. I crashed a slow street stock car the first time I hit it because it threw me off so much from what I was expecting. I got it saturday. Getting the feeling for everything and my lap times and setups are vastly improving.