I absolutely rebuild. I've always been a bit of a tinkerer, so when I got back in to vaping and saw the advances in technology, such as RDAs, I thought it would be fun to try out down the road.
After vaping for a few days with my iTaste VV, and seeing how quickly the flavor went weak on the clearos that came with it, and the cost of replacement, I dove in and ordered three Igo-Ws, an ohm meter and a couple of rolls of Kanthal and cotton balls and haven't looked back.
Of course the economies of it hasn't really panned out, since last Friday I ordered a telescopic mod, 18650s, 18350s, charger and a Kayfun (from MadVapes, natch). That would have bought a lot of clearos and naughty heads, but where's the fun in that!