I have been using my Innokin VTR for 5 months now and love it. Work in construction and it takes a beating. I have bored out the outer ring (not cut off!) to fit my kayfun and use it every day. I used to carry stick style pv but after breaking many 510 connections the vtr seemed a good idea. Was hoping if anyone has heard of a dna powered vtr or something similar on its way. Was thinking of trying out the reo but heard they might have something vv vw on the way as well. Nothing against mechs. I own two and like them as well. Just like having the ability to switch power on the fly and not worry if my battery is low or fully charged and give a weak or to hot of a pull. Have seen others putting the dna in there vtr on there own. Definitely not looking to tear anything apart.