I have two of these and love them.
When I first got them they did leak some (and I did post here about that) but I learned since then that when a tank leaks it's usually due to one of two things: A> the wick setup isn't right for your
juice viscosity (so you need to remove or add flavor wicks... or better yet re-wick with cotton) or B> the draw is too tight for your
vaping style and you are pulling too much juice in by sucking too hard on the device.
In my case I was looking for a tight carto-kind of draw and so blocked two of the airholes in the base, and that caused me to pull in too much juice and cause leaking.
Which brings me to the draw. There are two styles of
vaping. #1 is the carto/cigarette draw where you draw vapor into your mouth, then take a separate breath to draw it down into your lungs.
This style of vaping requires a tight draw or you feel like you need three sets of lungs to get any vapor. People who look for this experience don't like airy devices.
#2 is the straight-to-lungs draw where as you pull on the drip tip you are also pulling in air with your draw.... this a long, slow draw that actually results in getting more vapor to your lungs.
This style needs good airflow or you feel like you're sucking on a blocked straw. People who like this style don't like tight devices.
I prefer the carto type draw because it's most like smoking, but I don't think it's possible for a clearo to hit that way. If you tighten the draw (on any clearo) it tends to cause leaking or flooding. So over time I have learned to vape clearos different, doing the straight to lungs draw. And after unplugging the two holes I blocked in the Aro base, no more leaking and it hits great. So imho the Aro's are a straight-to-lungs device.
So bottom line, they produce more vapor than my Protank 2 and are less trouble. The Aro heads also provide more flavor to me than the Kanger heads. And if you're into rebuilding, they're great with a micro-coil of 7 wraps over a 1/16th drill bit, with a nice cotton wick. AFAIC the Aro pyrex tank can't be faulted. If other gear is being finicky or causing problems, I can always count on the Aros to work.
Good luck.