Instruct: Classify Amazon reviews into positive or negative sentiment
Query: a good buy

This mat is great! It is so soft and thick that I don't feel the hard gym floor compared to my old mat which limited what I could and could not do. Because this mat is so thick though, the imprints left on it stays for a while and it makes a creaking crunching sound when switching between positions. But other than that, a good buy!****UPDATE 24 February 2012****This mat was used fairly often for about 2.5 quarters in school. It does stretch when you do positions such as downward dog or planking AND it slides. There is no grip on this mat. I accidentally stepped on it a few months ago and threw out my back from that. I couldn't move or sit about a week before finals. Not good so BE CAREFUL when using this mat. It also has started to tear a bit from the use.