I thought they were a good idea too. Got my first batch from Volcanocigs.com, I used one of those for a month. Noticed I was going through alot more juice, like 50% more than I normally vaped. I haven't had much trouble with them. Did notice that they wick better held horizontal, or even battery high. Then I started reading on the forum about all kinds of problems some are having with them. Apparently some juices can interact with the plastic the clearo's are made out of. Read about some people having problems with the Clearo's cracking, and even melting. Myself, I haven't had this experience yet. Worst thing I've seen is the first one I used, the tube started spinning on the batt connector. So I switched to another after a months use. If a Clearo lasts me a month, refilling at least 3 times a day, I'm a happy camper. My devices are eGo/Riva class, and ProVari. All I vape is 50/50 or > % VG Cinnamon. That's what I know, but I don't like what I'm reading. Hence, I've ordered a MAP Tank from CoV. Mostly cause it is also clear, but holds 5 mL of juice. Since some juice seems to be causing problems with the Clearo's, I suppose the manufacturer would change the composition of the plastic used to something that will tolerate any juice. JMHO
Cheers,
otrpu