And despite evidence that they are bad for your engine, people still argue that they're just fine. I once quoted Shep, Buschur, and Marco at Magnus along with several assorted 10 second dsm owners all giving valid reasons why you shouldn't use undampened pulleys along with first-hand accounts of unusual bearing damage and even snapped cranks, and I still got a "well, my engine hasn't broken yet" response. It's frustrating. It's true that many people get away with running them, but that doesn't make it a good thing.

*Edit* This was all 4G63/Inline 4 related, though. Different engine configurations will probably have different results.