I've been using betas since iOS 4, and on the iPhone 5s, this is the least buggy beta I've used. Settings is a mess still and crashes all the time, but almost everything else has been solid in general. There are minor bugs to be certain, but nothing I can't easily deal with. I wasn't planning on switching to iOS 8 this time, but my 7.1.1 install has been having major battery issues and I thought, why not see if the per app battery usage in 8 doesn't help me find out if a specific app may be giving me issues. I know 7 and 8 are different, but it'd be a better starting point than going through all my apps one by one in 7. But so far, in iOS 8, my battery life is outstanding. Without a doubt, the best battery life I've had on a beta and worlds better than I was getting on 7.1.1. I'm liking the new messages so much I'll probably just stick with this.