I just loaded up ios 7 today, and it seems to work ok, but there's something wrong with itunes match. In the music settings, I have "show all music" and "itunes match" turned on, but the only music showing up are the songs I purchased on itunes. Around 150 songs. I have around 2000 songs uploaded into itunes match, and they showed up fine in ios6. I've tried every combination of turning those 2 options on/off, and nothing worked.