Actually, with the new tubes, removing and replacing is a breeze...
They pop right off and on easily, and don't leak at all. Out of the 15 or so that I've used so far, not one has even hinted at leaking one bit... When I get a new Fluxo, I pop the tube off, put a drop or two of juice on the coil (you can skip that part, I'm just paranoid about scorching wicks) and 'dry burn' until the coils glow. When they are new, the coils don't glow. It seems there is a little coating of (?) on them that needs to get cooked off before they start rockin.
I suggest NOT dry burning with the tube on... You can melt it! Even going in short bursts, that's just too much heat with no moisture or airflow to temper it...