My issue with the coils is simple - i hate using cotton. It doesn't last and 2 days is good and then rewick. It's good in a real pinch - say you have no time to make something good and can borrow a qtip from some strange woman!
The xc-116 is well worth a bash - it's silica and durable, i managed nearly 2 weeks from it. SS mesh is hard to run in an RM2, even if you hybrid it with cotton yarn thru the middle.
Porous ceramic - waste of time - might as well use a dripper.
The micros are some nice looking coils though.
T
Not only do they look nice but they work great too.
Don't have to use cotton to use a micro. Although rolled cotton wicks awesome, I build micro using Ekowool, it just requires more patience to thread it through. I don't see any reason why you can't do the same with Nextel.
Not sure if there is any difference in form between XC & XS but XC is ceramic & XS is the silica.