Hey, hey:
Stick asked me to post up in his HA vs E thread, but I followed the link at the end here instead.
I've gone over this a bit in the HerbalAire fans thread by hudsonrulez, but here we go.
I have found that when in non-assisted whip mode, I'm not that into the extreme. I much prefer the HA for direct-draw. And because of the efficiency, I use the HA every day. But when you turn that fan on, and you've got ample bud in the bowl, the Extreme is a kickass unit. I run the forced-air whip through an 18' bong with an ice catcher. To which I add four ice cubes and no water. If you'll excuse some salty language, good herb in this setup tastes like God's pussy. I'll pause a moment to let the ramifications of that statement set in.
...
The only trouble I'm really having is that I find if the bowl doesn't contain a goodly amount of herb, the hits are thin. So I really only use the Extreme on weekends. That goodly amount of herb will produce a ton of vapor, but it's not all the time that I can (or want to) vaporize that much in one sitting.
So, and I can't stress enough that this is strictly my experience, if you are the type who likes to vaporize a lot at once and get blasted, the Extreme is for you.
If you are a grazer, and you're into getting maximum efficiency, your better off with the HA. Or, perhaps better still, a PD. Although I haven't tried the PD, I've read the entire thread on this forum and it comes highly recommended.
Stay high.