So, I've been on the dev beta, and beta 6 for me, is stable. But the battery life is horrid, which wasn't the case on beta 5, again, for me.
I went to bed last night at 100%, woke up with it at 79%, I've used it for a 30 min workout and at 7:15pm CST it's at 40%
Not that huge of a deal, but I noticed it.