Hi, I use the dripper for 4 months now . I am very happy with the performance and I consider it as one of the efficient- high capacity dripper atty.
Concerning the resistance and non resistance wires, I use them both cause this way there is not any chance to harm the bottom o ring and on the other hand I get lower temperature in general.
When I change the coil, what I do, is throwing the wick and the wire and replacing them with new ones. I usually do it twice per week, depending on what e liquids I use. Once per week in fire up the ceramic (ce2 type) with a torch or something like that and becomes new again.