I got this for my daughter when she was 10 and choose the 13+ box. Occasionally she’d get something she really liked but for the most part it wasn’t anything she really used. Typically it would be like a pair of sunglasses, socks, some sort of cheap necklace/bracelet, maybe a notepad, pencils, candy, etc. I also got the adult version box for myself and found that it had at least half the same items that my daughter got in her box. We ended up cancelling both. If your going to try it, maybe buy one month first and see what you think because every month is very similar.
This is one of my fav boxes I get!