Here are a couple of things that I think would improve the master password screen. No doubt many of these are on your radar, but I wanted to get them down in writing. I'm using a Nexus 7 and Nexus 4, both running 4.4.2.
- The text field should be left aligned at all times, like the iOS app. It's weird to have the insertion point move when you start typing.
- The unlock graphics (which, I just realized, resemble a sideways keyhole - nice) should slide down to be centered if the keyboard is dismissed (possibly only applicable on tablets).
- Partially reproducible: a couple of times, when I unlocked and the lock screen slid down, I could see my device wallpaper behind it during the animation. After the animation, the main 1Password UI appeared suddenly. I managed to reproduce it a couple of times, but never while recording the screen. I'll post again if I can get it to be more reliable.