I've been playing in one for a few years now. It's been a learning experience, and a lot of fun.
It's cool, because with both originals and covers you can play to any crowd by speeding up/ slowing down or adjusting your volume and use of distortion. Older folks remember hearing alot of the old standards, and if you play loud and fast enough, you can play at punk shows.
I've discovered some pretty cool bands in the genre, too.