6S) and it seems to be working fine. As always, unless you're the adventurous type, I'd recommend waiting a while before you upgrade – let other people shake out any bugs.
Features of iOS 9.1:
- New wallpapers
- Apple News is now live
- A bunch of new emoji
- Shift and delete keys look a little different
- A fix for Live Photos (eliminates raise/lower shots)
- 9.1 supports the new iPad Pro and Apple TV
Have you upgraded? Any problems?