It's an $11 rda, never really gave any of that much thought...I'm thinking of buying one, but I can't decide what model to get. Has anybody compared the performance of the different caps and bases? I expect the different caps will have different thermal conductivity, and the bases are likely to have different electrical resistance (presumably the painted ones having the highest resistance and the gold plated one having the lowest).

Mine whistles, it's too fiddly with coil size/height/placement. It was replaced with a Hotcig Castle, much better.