Harmonic Balancers / Pulleys: Educated experience needed

[CoolVanilla]

I'd like some feedback on any aftermarket balancer/pulley that you've worked with, specifically on our Hemi's. I'm aware of the ATI (http://www.atiperformanceproducts.com/links/pr/hemi/index.htm), but for some reason I seem to recall hearing that there have been issues with these balancers when installed on our Hemi, specifically. I'm also not thrilled with installing something that requires regular service like the ATI does, nor do I think an under drive is desirable for my streetable build.

Can anyone please comment on their experience? Good things? Bad things? Another after market alternative?

Thanks!