Have you experienced the weight gain from it?
Difficult to tell. I have experienced weight gain but that seems to be from the reduction in cortisol and adrenaline reactions burning calories and exposing a low baseline metabolism. I also use B3, aspirin and caffeine/coffee to keep the adrenaline response way down to remove the constant overstimulation.
I have a low tolerance to caffeine so presuming a sluggish liver (ALT is high) and am taking the advice given here to improve its function over burning excess fat, currently looking for the sweet spot as regards maximum nutrition with just adequate calories.