The 15"x15" (clamshell) HT-400P and 16"x20" HT-600P are both very popular time tested models.The HT-600P is the same as the HT-400P below except that it has a bigger heat platen at 16"x20" and can transfer items up to 1/2" thick.The HT-400P sets the standard in the manual heat press industry because..