I have been using the new cotton coils lately and I am so happy they finally made the change. As you recall, I was literally the only one complaining of the funky taste with the original stock coils. Now, with the revised coils, the flavor is as it should be! They also seem to perform very well with no dry hits yet. As for rebuilding them, I am not so sure since the cap does not come off like what it does with the original ones. I have not tried to recoil/rewick from the bottom hole yet. Managed to take off the top dish and will do it when I rebuild. You can use a chubby plier grasping the small chimney tube to pry it off. To put it back, there is another story and hopefully someone of you find an easy way.
I am mainly using the MS tank onto my 1100 mah Ego ONE battery. Love this for out and about! Most of the times, I have rebuild the coils to around .7 ohm making this one a petite subohm setup.