I too like hard paint and consider a rotary pretty much a necessity for its major correction. On VWs, I hear both sides of the coin and it has me

"It's as hard as an Audi"/"It's incredibly soft, I get micromarring with #80"
If you want to do any significant correction on hard paint with a PC, get a 4" pad setup. With the PC/6.5" I can round over marring and take out light stuff, but I just can't get the finish I want with that, or even the Cyclo. I know it *can* be done as I've removed fingernail scratches from behind doorhandles by hand, but I've spent literally hours on a single panel with the PC/6.5 (even with wool pads and 3M PI-II FCRC) and had virtually no results to show for it.
If you have hard paint, do yourself a favor and get the rotary. You can do major correction with pretty gentle approaches. (Yeah, you can use wool pads but you can also do it with foam if you want to play it safe, ditto with aggressive/mild products.) With hard, thick, factory clear a little common sense goes a long way.