I'm one of the people who voted "Yes". Although I lack the experience he has, I agree with Calvin's reasoning. Also, when I took my T-19 out and had an opportunity to inspect the pilot bearing (needle bearing) that was in the flywheel, each needle was flattened and some of them were broken. I don't know how old that pilot bearing was, but it was bone dry. I have some pictures of it, but it's on my other computer and I'm not home at the moment.
I have a Kevlar bushing in my ZF flywheel now, and while I haven't inspected it since installation, I haven't noticed anything resembling a problem either, after about 30K miles. A friend of mine installed one on his NV3500 flywheel (after swapping from a slushbox) in his Dodge Dakota, and while I don't know how many miles he has put on it, I know it's considerably more than I've put on my truck...and, again, it hasn't been torn down, but so far no complaints.
I can't say anything more authoritative until I take the clutch apart on my truck (which I have no intention of doing anytime soon unless I need to do the rear main seal), but so far, I have nothing bad to say about the Kevlar bushing, and after seeing the condition of the needle pilot bearing that was on my old flywheel, I think that that's a potential problem, and the Kevlar bushing may be the best solution available. As to the spinning problems that Geo had...I have no idea what caused that, or whether it's a widespread problem or if there might have been something up with the bore in his flywheel?
Just my $.02...