My only complaints are that the cover slides entirely off to easily if I'm not careful and I taped the battery and cover in place with electrical tape because they came off with normal handling.
A couple recommendations for it's design would be:
(1) Make a place on the back so the prescription label can be placed there (mine is used for a controlled med) and I'm more comfortable being able to show it if necessary.
(2) Make a smaller version. I take 3 small pills/day and could get by with something at least half the size.