QFT
With a background in building electronic circuits I have had an advanced grasp of Ohm's law since long before ecigs (as we know them) even existed. Still I see no real need to use a mech. Why use a mech and have to experiment with coils, worry about safety, and deal with declining performance as the battery drains; when you can use a regulated mod and throw nearly any coil on it, get a great vape by adjusting settings, while getting consistent performance as the battery drains?
For me it's fun to have something that pretty much isn't going to break to the point of being un-fixable. I saw an RTA (the Big Buddha by EH Pro) on sale that looked very KayFun-ish but it had dual coils and held 10ml of juice. The site had a 26650 mech mod (the EH Pro Dynast) on sale that matched it perfectly. Went looking at batteries and once I saw the Mooch tested CDR of 30 Amps (to go along with the manufacturer's rating of 40 Amps) and the 4200 mAh capacity of the iJoy INR, I was really interested. I do MTL so a dual coil set up works great for me from 0.75 Ohms to 1.0 Ohms. I go for a vape that is satisfying through the life of the charge; it can't be too harsh at the high end and it needs to die down enough at the low end to remind me to change out the battery. That it does.
I even have the option of replacing the glass tank wall with matching metal. My friends have told me that it looks like a small hand-to-hand weapon when I carry it. The heft, grip, and feel tells my hand that it would probably work as one using that metal spare tank. My experience so far is that it very rugged and very dependable...if you take care of it. If I were to drop the thing in a swimming pool/body of water/mouth of the hideous sea creature; I could take it out, clean it, dry it thoroughly, put in a different battery, replace the wick after dry firing the coil a bit...and it would be good to go. No more treating my mod as delicately as a cell phone with complicated electronics exposed.
To summarize: I feel very safe in that I won't tax my 26650 beyond it's 30 Amp CDR on the coils I build, actually these batteries are the safest single batteries in that regard that I can reasonably get my hands on. The design is rugged because it doesn't house any of the electronics of a regulated device. With some forethought the coil can be made to be both serviceable at the highest charge level of the battery and weak enough to serve as a warning when it is time to change out the battery - the vape becomes unsatisfactory as you approach the lower end of the battery's charge. In these ways it is very much like the smaller AIO devices. In fact this could be seen as the much older brother of the Kangertch EVOD Pro (version 1) that I enjoy carrying about with me on a work day. It's just bigger. And more powerful. And better in every way. I enjoy monkeying around with it.