I use the 3.5ml when I want to fog bank a room to zero visibility just because I can.
I have found I have to be careful when using it in the car. It will fog blind you momentarily between your face and the windshield. With the guts removed from the whistle tip, I am not getting this condensation issue. My favorite part of these things is the draw and the warmth. It's not that hot-boxed warmth. The draw is the best on these. On most other reviews of clearo's, you see the reviewer pulling on some of the other types for 5-6 seconds and you're expecting vapor to start rolling out of their ears. If you whoof like that on one of the 3.5's modded, someone will call the fire dept.
It's not the most plug'n play device out there, but the fact that it is redeemable multiple times to like new, or better seemingly at times, it is at the very least a great stand-in with regards to consistency. I suppose it's not as recommendable as some more of the user friendly devices, but it really seems no more work than most carto/tank systems, and certainly less funky than an drip atomizer.
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