Having had some experience with these clear models now, I think I can honestly say that they either work well right out of the pack, or they don't work at all. I've said these things were good in the past, but after a string of duds, I'm personally done with them.
If you still want to get some mileage out of them though, and this is going to sound dirty, but I found that sucking air
through them without
vaping can sometimes help to get the wick going right. That's just anecdotal, though, not proven by any sort of science or logic. I just remembered reading something about improper airflow
through the cartridge and decided to give it a try.
I really wish they'd get these cartomizers to a more reliable standard. I don't think they do enough quality assurance checks on the product.