PST Polygraphite bushings

In another post, 2darts said the PST polygraphite bushings did not have the squeak issue others have reported. That's the first time I saw anyone say anything except "poly bushings squeak". OK, maybe the average poly bushings are noisy, but I'd like to know if the polyGRAPHITE ones have solved that issue. They seem to have done it for one user. Does anyone else have actual using experience with the PST product.

Also, just how much more solid do the poly bushings feel compared to the stock rubber ones. I know new rubber bushings will be lots better than what I have in the AZ Dart (which may be the originals). Noise issues aside do the poly bushings give more stable firmer handling than even new rubber ones?

ATB

BC