First of all - Thank you Justin for investing your time and creating an app for the guitar community.
I have installed this app some time ago with an intention to replace weekly paper version from Justin's book. With the later I was actually quite happy - I only wanted to have the timer and the info all in one
The fact that the timer has 5 "prepare" seconds (or 3, don't remember anymore) was really cool - much better than Iphone timer.
In general I have expected that the software will actually save the consequent results of the same chord pair in order to see the progress (like the paper version - M, T, W, etc.), to my surprise in the result page there was only one number present for each chord change, which didn't give me any feedback - was I getting better? how fast was I getting better? As I have read in other comments the app is supposed to save the highest count and then I guess with the reach of 60 changes the chord pair was marked as "learned". For me it was not enough - like that i couldn't see how fast i was progressing.
Another strange thing was that random chords were actually not random at all - from 10 or more chord combinations, the software used to pop up the same combination 5 times in a row.. thought maybe I was doing something wrong, but the app is straight forward and there are no possibilities to do something differently.
Functionality that I was missing was the ability to chose chord pairs "of the day". The training plan suggests to spend 5 minutes for chord changes, but my problem was that sometimes it took 5-10 minutes till some particular chord combination popped up at least once - I guess its the same randomness problem. I would propose to add the function where one could chose 5 chord pairs which would simply go in a sequence.