I picked up a KTS+ from FastTech, and after following some instructions on the internet and sanding the chrome finish off of a couple key spots, it works great. I don't have any other mechs to compare it to, but it really vapes well.
To me, it is an upgrade from my MVP 1.0 even though the MVP is variable in the voltage, there was always a lack of 'directness' in the current, almost like a sluggishness from the time I pushed the button to the time the coils fired up. My eGo stick just 'felt' better and more direct and immediate than the MVP. I always assumed it was because of the extra circuitry that the electricity needed to pass through to get to the coils. The mech mod that I have now has that same instantaneous direct feel that the ego did. When i push the button the thing just starts buzzing and snapping immediately. Granted, I also got a bit better at building coils, too.