I've never understood Sigeleis thought process'. Some of their design decisions are just plain terrible. The #13a is one of my favorite MODs...then they "improved" it & turned it to crap (#13b).
I've got every iteration of the #20 (Version 1, V2, & V3) and though I love the form factor - they all have serious problems that relegate them to the "nice but no cigar" drawer.
The various flavors of the #19 are all very nice MODs after a bit of tweaking, and the 8W is nice also (after tweaking the switch), but their "Bagua" clone was a MAJOR disappointment....a complete Fluster-Cuck. (IMHO). What were they thinking????
I've been staying away from sigelei for a while until they straighten their act out. The competition is walking away from them.... Sorry to say; Ive gotten some MODS from hcigar & EHPro recently that are orders-of-magnitude better than any of the Sigeleis I own. They hit hard and work well right out of the box....nice switches & even silver-plated pins.
Hopefully sigelei can get back in the race soon ...
I do use my ehpro EAs on a daily basis at home. But, my wifes segelei #24 works pretty good as well. I've never checked voltage drop on it though. It's just for backup.