Some of the key characteristics for 'good' heat presses include even temperature distribution, accurate temperature, even pressure and speed of temperature recovery. There are also secondary considerations such as ease of use, clearances, actuation forces, etc. The 'better' heat presses such as GeoKnight and Stahls do all these things very well. The less expensive heat presses will have more thermal gradients, will be slower to recover and won't have the temperature as accurate.