I've used Zamplebox and DripClub. Never been satisfied with either one. ZampleBox just sent me a garbage box, there was one
juice from Alpha Vapes I think, but other than that there were a buncha juices from vendors I'd never heard of. They were all perfumey and gross, tasted like they'd been made with cheap flavorings.
With DripClub, I told them distinctly in my preferences, "No custard, no chocolate, or I unsubscribe." My first box contained (not even kidding) the Drip Club's in-house "Chocolate" flavor and another custard flavor. What the hell, guys?
Maybe you'll get one or two juices in the box that you like, but the rest are usually obscure brands/not very good. You're almost better off watching
reviews and then buying small bottles from the vendors to find out which you like. I was never satisfied with either of the subscription services, and most people I know who tried them out are equally disappointed.