I have been using the Yocan evolve plus with QDC. I recently bought the Yocan Pandon with double QDC. It has 3 different temp control functions. See attached photo. I'm using the evolve plus for the harmalas/dmt shatter I make now(vile on left). Works great. If you are using crystal just pulse it and melt it, put the cap on and then pulse while you hit it. You can taste it and you know you are getting a hit, its smooth. I usually feel it after inhaling for only a few seconds.
I haven't used the Pandon yet. It's probably superior to the evolve plus. Its a double vaporizer. Not intended for those that scare easily. When the coil gets dirty i let it sit in 70% isopropyl for a couple hours then air-dry. I had too many problems with e-cigs. IME They are indeed harsh, not reliable and way more trouble than they are worth.
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