Very convenient and useful!
I just purchased this to help with my 80 year old fathers pills.  With his hands being very arthritic these individual day boxes are much easier for him to dump his group of pills into a cup or his hand to take.  The individually numbered containers will certainly help him keep track of any pills he misses.  So far the only issues I have are 1.  the lids for each compartment are a bit flimsy and some of them take a bit of time to snap shut, and 2.  The set contained to Day 21 containers and missing day 24.  I had to use stickers to mark Day 24.
Rating: 4 stars