If you don’t change your PIN before you run out of uses you will be locked out of the app and unable to change your pin. There is no warning, just a message saying you must change your pin, without a way to actually change it. You can only generate something like 150 passwords before you’re required to change your pin. I’ve since gotten in the habit of just changing my pin every month or so. The app is dumb enough that it won’t let you use your previous PIN when changing it, but if you change your PIN twice you’ll be able to use the same PIN you had before.
The other thing that bugs the crap out of me is that once you generate a one time password, if you hit `return` you’ll be taken to the settings menu. Why not have this copy the passcode? 99% of the time that’s all you want to do.
Clearly the guy who wrote this app does not have to live with it on a daily basis.