Now Is A Great Time To Try the iOS 9 Beta
If you want to move off of iOS 8.4.1 and try iOS 9, you can.
Apple's public beta is open to those that want to help out with testing ahead of the update's release. And right now is the perfect time to consider trying it/testing it ahead of the iOS 9 release date.
For one, the iOS 9 beta is as stable as its ever been. It's also as feature-rich as its ever been. There's still a potential for problems but that's a risk you'll just have to take.
The nice thing is that you'll be able to drop back down to iOS 8.4.1 (this is for iOS 8.4 so you'll just want to swap the iOS 8.4 references/files with iOS 8.4.1) if and when you decide that you've had enough of the iOS 9 update.