I like most of the crystals; however, this last box had a fossilized turd in it, which I don't know that I would classify as a "crystal". It also had a bag labeled "black kyanite" but it was a green stone and didn't look like black kyanite.
I think the large crystal each month is pretty cool - the smaller ones are usually neat also (minus the turd, that was kind of something I wouldn't have anticipated being in this type of box). I enjoy getting surprise crystals each month, but I'm not sure how much longer I'll continue the subscription after the last box I received. I may change my subscription to one of their cheaper boxes to see if I like that better.