I have the purple/yellow matt that is 24 x 36, and cannot say enough GOOD things about it. No smell when it was bought and my blades last for a long, long time (I cut almost every day). I'm going to invest in the smaller matt to take to classes with me. Also have their cutter and their blades last a lot longer than any others that I have used (except olfa). Have never tried to iron on it, so cannot tell if it's heat resistance.