no, they are all suitable. and here's why: superb temperature control. i have convinced myself that an accurate (meaning consistent) temperature profile will extract exactly the herbal component desired. the rare times i have access to sativa it is just as wonderful as anything else that the herb fairy delivers. i am recently finding (re-learning) that less is more. i using about 1/4 of vial -- loose fill, no packing to keep the air flow optimal -- and it is just as effective as using full vial. PLUS there is less opportunity for tolerance buildup. also, i think i am beginning to like the AC power supply -- just a little bit more convenient than the battery on the desktop (this from someone who curses the stupid extra mouseclicks required because software managers don't understand how software is used). It will be part of the standard package.