My favourite rebuildable (well semi rebuildable I suppose) is the common or garden protank. Whilst the KFL, and it's bedfellows,may give a superior vape, recoiling one whilst sitting on the river bank fishing is just not as easy as unscrewing a protank head and replacing it with a freshly recoiled one. Another thing that I like about the protanks is that I can actually fill the whole tank with juice, not just half of it.
Kfl + so far, I also have a Taifun gt on the go, I do like this but not yet getting the best out of it, using micro coil and cotton but only at 1.5 ohm with 0.32 kanthal, not yet ventured sub ohm and may have a re coil tonight;-) Ninjaassasin1983 any tips matey:-D