it has a few issues...
1. you can unlock it with your face
2. Silder doesnt bounce back if you dont slide all the way, it stays in the center.
3. Can unlock with exit/return key.
4. Hard to read number on screen
5. Once unlocked, no soft key to relock (option for convenience key)
6. Runs all the time in the background, rather than opening when on a call.
But its still in beta, maybe they can fix some of this stuff... overall, i like the app and am very glad to have it.
There was a new release made just today that not only fixes a memory leak, but also is said to cause the slider to "snap back" if you don't move it fully from one side to the other.
I just installed it myself so haven't had a chance to test it, but you can read about it in the apps subforum.