Lightweight flywheel?

Has anyone found an aftermarket flywheel for 3.8s yet? I've been looking and it seems like a lost cause, but I thought I'd ask anyway.

Thunderracing.com has aftermarket flywheels for the 3.8l but it looks like you have to buy it with the clutch.

Tbyrne.com sells a billet aluminum flywheel for the 3.8l for $429.99.

dang, $400+ i guess it's about inline with what those usually run. kinda out of my range though. :/ has anyone actually put one of these on? is there any decent feel/gain with it?