I think there's three good reasons to not like the MFLB: Operation: While a simple design, it's not user friendly. Lots of charging, pushing to make a contact, requires precise operation with little headroom for error. Effect: For some people the MFLB just does not cut it. I could never get as high as I wanted to be with the MFLB because of how hard you have to work for such comparatively little vapor. The vapor is near 100% conduction effect, and has a huge comedown that makes me super tired. I go for convection vapes now. And finally? The fanboys. I should be careful how I proceed here, since there's a lot of MFLB masters on this site that would not fall into this category; but there is a huge community of people who do nothing but praise the MFLB as the best vape in the world. It's huge on Grasscity. You open up threads on totally unrelated things, like "Should I buy a volcano" or "Best plug in vape" and you'll have thee, four people going on about how great the MFLB is without even reading the thread.