I personaly dont do em. or am not a fan of them. The OE made the Crank pully a certian weight for a reason. this goes the same with a Flywheel. the pully isnt just there to run the belts. they are there to absorb the Harmonics made in the engine. When you lighten the crank pully or flywheel it is totaly harder for the harmonics to be absorbed. this caused the botom end to be under unneeded stress, causing bearings to wear faster.
One of the main things Honda and all the car companies look at when building a car is cost obvously... they try to keep things as cheep as possable, but still be quality. They couldhave had lighter pullys and flywheels if it was ok for the car... after all that would save them money while building the thousands of cars... but since they didnt do it There is a reson for the parts being constructed the way they are.