i've been using mechs for years, and i just "upgraded" to a regulated device. i use a 0.4 ohm dripper and a 0.9 ohm kfl, used to be i couldn't fire these on anything but a mech. nowadays with all of the high power mods coming out, i don't see any reason to use my mechs anymore. new apv's can throw out more power than i'd even consider using, all while monitoring my battery and build to ensure their safety.
that being said, my top mechs:
1. poldiac - just a fantastically built device, higher quality machining than anything else i've seen
2. reo - the original rda tank mod (although that description definitely does it a disservice)
3. sentinel m16 - my favorite mod from the philippine mech invasion
4. k100 - just a good, cheap, original china mod, always liked it
5. nemesis - i suppose i have to mention it for the list to be complete