OK so we've probably all seen the Volatizer VM3. If you don't remember, its the vape that looks like a more sophisticated iolite. Oh, and price-wise it runs in the same neighborhood as the volcano. I don't know anyone who has actually had the balls to spend that kind of money on a portable, but please let me know the quality of it if you have! I mean potentially speaking, if the iolite could produce the same quality vapor as my other 5 vapes, I would only use the iolite, but it doesn't, so I don't. Some things it features that the iolite doesn't are, adjustable temperature control, retractable mouthpeice, and digital display. Oh, and no butane. Sounds nice, but again, its portable, and IME, portables just don't compare to desktops.
http://www.vapenow.com/Volatizer-VM3-Portable-Vaporizer-p-86/