its PWM. some people are not cool with that
Every regulated mod is PWM. Period. Linear regulators are way too inefficient. Good mods do this at a nice high frequency, and filter the output so that you get a minimal 10mV ripple, essentially a straight signal.
Cheap mods use really cheap regulators that PWM at low frequencies and don't filter the output. ie) Vamo and most vv ego mods
Pretty sad when you can get a dc-dc board that does it right for $25.