I Love this box! As a US customer, I feel that the shipping cost is usually worth it for the exclusive books and high quality items. On occasion I may not enjoy a specific item but they tend to send bookish items that you can use in everyday life. Also, their SE's are to die for! Throughout my time getting them, I think they just keep getting better.
I got the Last Unicorn SE box that was decent and another box only once. A few of the items a found a little "kid-ish" but to be fair I'm in my 30's. As YA box it seems pretty good. The SE box I got was lovely and the only times I didn't personally enjoy I was able to give to a little girl who LOVED them. Items are good quality and I do like that Naomi chooses books that not a lot of other companies choose. Would recommend.
I've only gotten a few boxes from them. I usually get the "book only" option just because I'm picky about merch from any box. They seem to have a good selection of curated items and most seem to be pretty good quality. The boxes I've received, I've enjoyed. Their special edition boxes are always amazing.