I've made about 130 shirts on it so far. You do need to have it on a very flat surface to get equal pressure. We started on a plastic table that had a slight sway and kept having one corner be a problem. Once we moved it, it was fine. Also, I'm not sure that temp is accurate. By that I mean that we had to raise the temp to about 15-20 degrees over what the material calls for. However, once it is there, it stays very well, does not get hotter or cool off, so I'm not complaining. Very pleased as usual with my Vevor purchase.