I've only had the glasses for about 2 months, and I've already had three crack all the way through. One cracked while in the dishwasher, one when I put it in the microwave for 1 minute, and one cracked (and broke open) when I poured some hot chocolate into it. I've never had problems with any other glasses - just these. If it weren't past the return period, I'd send them back in a heartbeat. Definitely not worth the price...unless you don't mind your drink seeping out through the cracks.