yeah numbers 19 and 20 have my vote! I love em! you'd SEE your battery going thru thermal runaway before it even began to pose a serious risk of injury to you or your possessions haha, i love that design! nice and open! & if it had a chip, well, that chip will probably outlast every other regulated-mod on the market and in the public's hands, all due-to the ventilation benefits. awesome mod!
I am planning on going to a trade school for electronics repair and circuit board building/etc. If i do, u can expect to see many a plumes.91 mod to come, in the next few years.
awesome.