My experience with clearomizers has been bad. I read everyone's posts about them, some negative, some positive, and picked up a few packs to test out.
At first, wow, I thought they where great, awesome flavour, great throat hit, although low vapour production at first, figured i needed to break it in.
Well, after about 15 inhales, the burnt flavour came. I tried dripping right onto the wick where it is wrapped with the atomizers coil, another bad idea, this is directly above the air hole, so liquid will run to your battery.
After frying a few, I tried moving the rubber ring inside up, as was recommended in youtube videos. I found this increased the wicks saturation resolving the burnt flavour, however a new issue presented itself, liquid would get in my mouth about every 5-10 inhales. This is worse when the rubber ring is removed as some users suggested, and moving the rubber inside up, to allow more space for the wick to saturate, or removing it completely also means the air passage of the clearomizer will flood each time it is knocked over, or set on its side.
I also refilled & used the same clearomizer about 10 times, as I know many users will refill repeatedly, even when they get the bad burned flavour. At this point, I began getting cracks along the bottom and top of the clearomizer, this resulted in leaks everytime it was filled.
My conclusion, for anyone who bites, or chews on the top of their cartridge, or their cigarette filter, do not buy these!
If you do buy them, do not put your ecigarette with a clearomizer attached into your pocket. the plastic section can be pulled off the metal bottom piece, if this happens in your pocket, the contents of the clearomizer will leak out.
My personal opinion of these things is they are not safe enough to be marketed, and the manufacturers selling them without further development are irresponsible. This is just my opinion, but if you are a retailer Id suggest doing extensive tests on these clearomizers before offering them to your clients.