50w may be just a touch underpowered. Personally, I find that I tend to set my power so that the output voltage is right around 4.1-4.2v. If you like to vape 0.3 ohm coils, I'd recommend going with something capable of 75+ watts.
Just a quick background, I did use mech mods exclusively for the better part of the past 2+ years (perhaps that's why my tendency is to vape around 4.2v). I recently made the switch to regulated because I don't see the point of using a mech anymore: I can get the same power and vape experience as a mech, but with more consistency throughout the battery life, and the added protection of continuously monitoring the battery, build, mod temperature, etc.