Almost ironic, I installed the update, started up the phone, opened music app and it crashed, and it did it again and again. Genius mixes are still not working on my devices(UK). Also I am not keen on the new male Siri voice, i liked prefer the old one.
Woah, if it's that unstable, I suspect your setup may be corrupted. This thing went through a few months of testing by developers and Apple. I tried beta 3 and even then, it was already better than 7.0.x GM.