No change of mind here. Only bugs that I really notice are misalignments. For example, in mail, the top bar sometimes blocks part of the top email. And the search bar is at the very top of the screen instead of a bit lower sometimes. So small things, but the new features absolutely make up for it. So yes, definitely go for it.
Sent with my iPad Air 2 with slide-over.
EDIT: Battery doesn't last me the day, but I'm pretty sure that's only because I'm using it so much.
Where I am at the moment
Thanks - another question - there have been a lot of complaints over the last year about bugs and performance issues with iOS 8.x. Did you have issues with 8.x? Do you notice any of these with the iOS 9 PB? I'm assuming the answer is no from your posts, but wanted to ask.