Okay, so I was being a bit of a smart arse.
I've been playing around with three different pre-polymer foams for a new line of 6" pads. The benefit of high density pre-polymer foams is that they have the ability to generate heat faster with less linear motion.
Now, you may ask yourself why I'd want to intentionally generate heat. After all who wants a buffer burn? Well, the reason most people have a difficult time removing swirls with a PC is because the pad can't break down the oxides in the polish. If you can't break down the abrasives, you can't "polish out".
To truly remove defects with a PC, you need polishes and pads to be correctly matched. The pad has got to generate enough working energy to make the polish do its job.
db