I think you've all forgotten about this little great device, the Smoktech Gripper
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She went from 3 to 6V, was a little flimsy but it fired hot and steady. It used PWM, and I never had a coil pop on me vaped at regular voltages (2v+the ohms of the attached atty) and used a regular 18650.. It was discontinued because people loved things like tube mods. Mine finally stopped working when the pin broke. Same case scenario with the iLeaf, only with a smaller footprint.
We can argue about the iLeaf but good ideas will always come around. If you don't like it or are dobious about it, don't buy it. That's all it takes.
I still have a couple that I use everyday. I just adjust it for the best taste for the topper I'm using, and don't get hung up on numbers. Every mod I own hits aq bit differently with what would be the same voltage / wattage setting, never worried about the number just the taste.
The rep these got for being "off on the number" forced them off the market, lost a good low cost VV mod.