Aluminum Flywheels..what do you think?

Sending out a feeler on what are your opinions are regarding aluminum flywheels? Anyone using them?

From what Ive been told aluminum flywheel helps the engine rev faster.But with relatively heavy cars you want to stay with a steel one.Somebody else could probably explain it better to you.

I've got one on my car, the engine does rev faster and it makes driviability on the street better. For racing the RPM's fall a little faster when shifting, so you lose some kinetic energy.