The new OvenTamer controllers are well worth the money. When set to 200 degrees, my cheapy toaster oven would range from 180 to 260 degrees. This wasn't ideal for cactus juice, pre-heating molds, or final cure of Alumilite. I've only used the tamer a few times, but after the auto-tune, the temps climb to the setting and are stable within a couple of degrees, and often within a few tenths of degrees. This reduced the bleed-out of cactus juice so more would cure in the wood rather than pool on my catch tray. I can pre-heat Alumilite molds, and when the pressure pot is done, I pop the molds into the oven at ~140 degrees for a while to ensure that the cure is complete. This is necessary for me to ensure a complete cure for tube-in castings.
Curtis was very helpful when I described my issues before I purchased the tamer, and I have always been very happy doing business with Turntex.