Stopped in on a Friday night with nothing to do (yes, in Vegas) and had a blast. $45 for two races is pretty standard, and these guys let you stay out there for quite a while. They're good about not letting drivers who are being jerks (bumping, etc) get away with it, and the races flowed well and were a ton of fun.
The course is a bit narrow and passing is difficult but not impossible. There's not much to do outside of racing, either.
I'll defintiely be back.