Well, one drawback is even though someone stated the cutoff is .2 ohms, 50 watts will approximately max out on a .353 ohm build (49.97 watts to be precise). My .202 ohm coil on a fresh battery (ignoring voltage drop, thats a whole other topic) should theoretically be at 87.33 watts (or it could have been 83.7 watts, its 3:40 am here and switching between tapatalk and vapors toolbox) so that is an extra 30 watts.
Is it a necessity? Probably not, even on a halfway dead battery (so not even the full 80 something watts) it is reallllly warm, and 2 second hits max, even though on my .317 ohm build I could do 8-10 second draws.
Once I have a fresh brain tomorrow I will give a little more feedback on weak spots on mechs vs. regulated devices, but I am gonna catch some zzzs for now. Also, I downloaded this chart on my phone and use it frequently, so feel free to do the same!