I really don't understand why everyday people want to be on a beta if they don't have to. The beta is meant for developers (to make sure their apps or what not is compatible with the public release comes out)
Betas will always be buggy and probably slower since optimizations haven't been made yet (especially when it's the first betas of a "big" version: meaning iOS 6.0 beta, 7.0 beta, 8.0 beta and not versions such as 6.1 beta, 7.1 beta, etc)