I was a customer of Candy Japan for a while (3 months) and I really liked it. The candy selection was very interesting and fun. A while back I tried a competitor and their selection was very boring and the candy they sent didn't feel very special.
The reason I cancelled with Candy Japan was that I found it a lot of money for candy. Not so much a lot of money for the service. Also, candy is just unhealthy, so I am probably better of spending that amount on fruit and vegetables.
Overall the candy selection is what would make me choose Candy Japan over a competitor if I would ever choose a candy service again or recommend one to friends.