I think there's a bug with Touch ID and App Store purchases. I've had to enter in my password to 'renew' touch id passwords a few times when buying an app. Not a big deal every once and a while but it's been happening way too often. Defeats the purpose. Hopefully that gets squashed soon. Unless there's a setting I missed....
As a follow up to this, I went into Fingerprint settings and turned App Store off and on. It seems to have solved the problem, so we'll see how it goes.
Is anyone else having problems with the fingerprint scanner? It is completely inconsistent for me. Sometimes I can't get it work at all, sometimes it takes 2-3 tries, and very rarely it works completely seamlessly as it was presented in the apple keynote. I even tried to record the same finger multiple times to try to improve accuracy but that doesn't seem to have helped.
Other than what I mentioned above, I haven't had any issues. So far it's been very responsive.