I just updated mine to iOS 5.0.1 and I'm abit impressed that it is faster than iOS4, although I still have some problems:
- Battery life is still bad. I usually have 10-15 hours of pure music playback but now it never even reaches 5 hours. All of other apps are not running.
- It gets hot after 30minutes-1 hour of music playback. This never happened when I am using iOS4.
- I can edit the songs in iTunes, although the artist name never showed up below the title. I tried using other music apps like eQU and it still has the same problem.
- When swiping the screen to spotlight, it lags a bit then it goes back OK. Kinda similar problem with other old(?) Android devices.
I don't really use the other features since I mainly use this for playing music. I also don't expect Apple to help us with this issue "as soon as possible" since I confirmed with my friend/s who work/s at Apple Technical Support and/or iTunes store.