ccure,
That wick-burning taste is probably one of the reasons for the practice of topping-off one's cartridges (a practice that, done in a timely fashion, keeps the wick moist). Nevertheless, one can only top-off a refillable cartridge - like the Nebula's.
That's not true.
It very easy top of the cart of the disposable cart/atomizer.
Just take of the little plastic top, add a few drops, put the little plastic top back on, and it's ready to go.
I've ben using the same "disposable" cart/automizer for a solid week now.
Without any problems.
Not a bad deal, the same cart and atomizer for about 3 bucks for a week and counting.