I've found polish-removal-by-PC to be problematic. When I do it, I use plush MF bonnets. BUT (big "but" IMO) many polishes should be removed while still a little wet, and that's tricky to do by machine even when you have a pair of them (one to apply, one to remove). Polishes like 1Z and some others can dry, so then you only have to worry about having enough bonnets (and I don't mean just six or eight of 'em

).
FWIW, I do 1Z polish removal by machine when I'm doing rentals/service loaners so it's not like I dislike/disapprove of the approach. But I have a *lot* of bonnets on hand so I can go through 'em as needed.
Removal of LSPs by machine goes a lot better and I probably do that way 98% of the time.
Yesterday I removed a coat of #16 from the A8 using one set of suede-style MF bonnets on the Cyclo, with a CBT follow-up by hand. Worked great but remember that I put my LSPs on *very* thin; most people will need a lot more bonnets.
In both cases, I use speed 4-4.5 (or maybe 5) for removal by machine when using the PC. The Cyclo is single speed but fortunately that speed works fine too.
I use cutting pads under my bonnets as I prefer the firmness and believe that the coarser pad grips the bonnets more securely. I've had come bonnet/pad combos (e.g., Griot's polishing pads and Griot's bonnets) that simply didn't work because the bonnet slipped around on the pad to much- the pad moved but the bonnet didn't.
FWIW, I've experimented with removal-by-foam and I don't care for it. IMO the pads (used by themselves) tend to load up more and aren't quite as gentle an approach. That's not a slam at justin30513's post just a case of different personal preferences.