I have lightened flywheel on two of my baja, A Darksoul CNC on my on0road and a DDM lightened one on my basher and goped. I see a big difference all the way around better low end and great top RPM. Have never had a problem with cooling even on my goped!!!
Just one word of advice dont use the Darksoul CNC for bashing or off-road use i learned the hard way even with outerwear all the way around.