I've been reading for a while. I'm going to purchase a vap soon, and I think that I have narrowed my (Wow I never knew there were so many) to the Extreme Q, the Herbalaire, or the Silver Surfer. I like the multifunction of the extreme, in that I can surely see myself using it (I'm probably in the minority here) for actual aromatherapy and similar applications. But, I'm a little concerned at the air-flowing-through-the-electronics bit. I alos like the idea of a lifetime waranty. I like the herbalire, but I'm really concerned about heating things in aluminum. And while I know that there isn't any real evidence against silicone, I'm wary of it, I'm a chemist and plastics have a way of being discovered dangerous way after the fact. The silver surfer has really great reviews, but it's doesn't seem to be as multifunctional as the extreme. I don't live anywhere near anyone (that I'm aware of) who actually owns and uses a vap - so I can't try one before I spend a lot of money. Can anyone out there give me a clear, concise comparison of any of the above models? Someone who has actually used or owned them? Any and all help will be GREATLY appreciated.