FWIW, I currently have a TPE mat (this one) -- it's cushy and pretty sticky. I've noticed there's definitely some signs of wear on it after a few months of taking classes 3-4x a week. For a $30 "starter mat," it certainly gets the job done (but as I'm getting more serious about my own practice, I'm strongly considering upgrading to a premium mat soon!)

That said, I wouldn't use it for hot yoga sessions without a good towel, though--I tried and slipped like crazy!

Hope this helps!