I gave this as a gift to my great-aunt who loves pretty rocks, but isn't a geologist and can't really define what she thinks is a pretty rock. I happened to be there when it arrived, so that worked out even better. She loved it, is trying to figure out how to display them, and is looking forward to the next box. As a geologist myself, I wasn't overly impressed, but the crystals were nice for the price.
I've only done one box so far, so maybe the next will go differently. I was able to complete only part of the box without going to the help file. Three of us were working on it, and we were completely stumped. After reading the hints, there was no way any of us was making the connections we needed to. Without the help file we never would have figured it out. I'm OK with a little struggle, but this puzzle was impossible.