I just added WhenLast to my new smartphone, and the process of installing it brought to mind several questions/issues:
1) Is there a way to delete all your examples at once, rather than having to delete them one by one? My categories were sufficiently different from yours that I preferred to start from scratch. I first tried to delete the categories, hoping that that would also zap the items inside them. That didn't work. So I then deleted each item and then tried to delete the category. That seemed to be successful, in that I was asked whether I wanted to delete the category, but although I said OK, the categories kept appearing. Eventually they did disappear.
2) Is there a way to manually enter a date when something was done and have that date be visible until the next time? For example, if I made an image backup on December 21, 2014 (before I had WhenLast) and not since then, I'd like to be able to have WhenLast show the December 21, 2014 date. I found I could write in a date, but it wouldn't be visible on the main screen.
3) Is there a way to synchronize WhenLast on two (or more) devices? I now have it on my Nexus 7 tablet and my smartphone. I tried to find a file or files that I could copy from my device to my computer and then from my computer to the other device, but I couldn't find it/them.
I'm very happy with WhenLast and would recommend it highly as it is.
The above are just a few points that might make the app even better.