The bags they operate with don't have stoppers so you waste a lot of vapor because you have to cover the holes with your thumb and you inevitably lose some vapor whenever you hand it off.
I've been using the herbalAire for a couple of years and I'll have to strongly disagree with your 'wasting a lot of vapor' statement. Sure it's nice to have a valve, but covering the stem with a finger (yes, any finger will do) is not a big deal. And once you've taken a hit and equalized the pressure in the bag, vapor loss is minor even if you don't cover the stem. Without a difference in air pressure, the vapor pretty much sits in the bag. The Extreme would be the same. It's a minor drawback and quite possibly a price difference of $240-300 would be more important to some.
vapefiend Reviewed by vapefiend on . Buying Recomendations - Considering SSV, Volcano, HerbalAire, Extreme... Been smoking several years, plan on smoking several more. This would be my first vape purchase and as much research and looking as I've been doing, I still have plenty of questions on what would really be the best for me, since I have little vape experience. Here's the breakdown. Price: $600 comfortable max, but a few hundred less would obviously be nice. Use: Most nights my fiancee and I smoke a snapper bowl each with dinner and/or before bed. Most of the time would be used for the two Rating: 5