Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great while they last.........A SHORT LAST!!!!

This mug works great while it last however, don't expect the mug to last longer than 6 months before it cracks. I actually bought this mug twice the first one lasted about 6 months before I notice the crack. I at first thought it was because I left it in the freezer too long.Yet the second one I bought and this one only lasted 2 1/2 months before it cracked. I also only kept it in the freezer no longer than 2 hours however, it still cracked.My advice if you HAVE to have is buy 2. One for looks and the other to drink out of even after the crack happens.