I had a bad experience at the Apple store tonight. My 5s has been having issues with Touch ID being sporadic - sometimes working, sometimes shaking its 'head' and sending me to the passcode screen. I've removed the fingerprints, re-registered them, and re-touched the sensor during in the settings screen. My camera also kept going in and out of focus. When I went in the store, I had a full iCloud backup ready. I explained the situation to the Genius, asking for a swap (I have AppleCare+). The Genius was very rude throughout, saying she couldn't reproduce it, even though the Touch ID/unlock screen shook its 'head' in front of her! Her fingerprint worked, though. I asked for a manager, explaining the situation, and got nowhere, and was told they couldn't swap the iPhone, and that the manager had to refuse. I went out of my way to do this... just feeling so upset at the experience.