Aside from the cheap ciggies China was selling on DX (used on and off for a few months and hated it - back in 2009/2010), I spent the first few years in the V4L ecosystem. My first was the Vapor King followed by the Dial-A-Volt, and then eventually the Vapor Zeus. I LOVED the Vapor Zeus (dual mode), would probably still use it every now and then if it were not for the problems with their Smileomizers (giant cartomizers). The Dual mode could be used as a manual or auto battery which was awesome.
I then wanted to try an RTA, but these only existed on 510, so I bought a Vamo V5 and an RSST - had no luck. Leaking everywhere, bad taste from the cotton I was using. Too much hassle. I went back to my Zeus and DAV.
When V4L had a crazy sale on their OMG Mods, I bought six and used them for about a year after. These were my first Box Mods and I was sold on the form factor. Replacable 18650s were a dream. Still on Cartomizers at this point.
About a 8-9 months ago I saw the istick hype and grabbed one along with a Nautilus Mini. Had no idea what kind of rabbit hole I was scurrying into. I loved it, used this setup for months. Then, you guessed it, The sub-ohm bug bit. Grabbed a Melo and an iStick 50w about 3 months ago. Since then I've purchased some Kanger Subtanks and other clearos, an MVP 3.0 and an iVP Mini 2.
Can't even begin to think where I'll be come December. But I just preordered a Subox Mini kit as well. My goto setup at the moment is my Kanger Subtank Plus on my MVP 3.0. But my Nautilus Mini set atop my 50w is the best I've experienced for flavor so it gets used a lot too.