I ride with a lot of different groups/people, and really enjoy it. I have been apprehensive about joining some groups, but feel like it doesn't hurt to try one ride - if I don't like it, I don't have to ride with them again. And most of my experiences have been positive. So I say give it a try. It really can't hurt. If they drop you, are annoying, etc. you don't have to ride with them again.