I like them. I think I'd prefer to drive the Thunder Roadster more though. The legends are more amusing to watch though.
I believe those vehicles were originally designed for ovals. It just happens they work well at a roadcourse as well.
There seem to be big guys in those cars. If you're concerned, why not look at a Thunder Roadster instead? Those look like they've got even more room.
I'm sure their confident at Auto-X. I do hear of people running them. That's not what their primary purpose is, so they won't be as good as other things, but I'm sure it won't let you down.
Watching videos of sportscar racing does not fully convey the experience. It's more like playing a three-way game of Speed-Chess while strapped to a chair... inside a giant beehive.