I bought a complete Super Pro polybush set from Gwyn Lewis, so going to try them. I have a 10T press, it managed the front radius arm steel sleeves after pushing the almost detached rubbers out.
I poly bushed my Golf way back with Powerflex, when I stripped the whole car down for refurbishment I reused all the bushes, still perfectly serviceable.
Didn't notice much increase in harshness either removing the elastomeric (sp?) bushes.