I really like the navigation features in the new iOS version, but I know that has a lot of complaints. If you use iTunes Match with a lot of songs I wouldn't recommend upgrading if you still want to listen to your music. On my 4S I can't even browse the list of songs without it being ridiculously slow. I can't even scroll the list of songs smoothly, or at all on occasion. Sometimes the music app won't even open. It just pauses for 20 seconds then exits.