Have been using only mechs for more than a year. Tested the same rda and build a long while back on a copper parallel mech and sigelei 150w with a comparable power setting, and the mech tasted slightly better, not sure why. 6 months ago switched to series stacked 26650 mechs, even better with instant ramp up, able to drive large coils, very tasty and long battery life. But these things are huge...
and lastly - it is kind of a paradox, but a mech gives a much more "colourful" experience as it forces you to vape your juice at different power settings, unlike a regulated that stays the same all the time. Cheers 
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