"decent mech" + decent batteries.
When you first start to pulse your coil and if all your
coils are not instantaneously lighting up evenly your resistance is much much lower than when your done pulsing out all your hot spots aka shorts.
It is definitely a use at your own risk method.
However, if you pulse your
coils with a battery that is not fully charged (3.5 - 3.6v) and use short pulses (like half a second) to start with you should be fine. I still recommend using AW's and some of the high drain 18650. With all mechs it's important to understand the c rating or max current discharge rating of you batteries.