I just finished a Black 4Runner with the Festool and love it! Unfortunately, it was a loaner and had to return it.
Pros: Very high speed orbital vs PC. pc6=Festool4 and it goes up to 6, about 6800opm. 7amps vs 3.7 on the pc, which means it does not bog down when applying pressure. If level 6 is not enough correction, switch it over to rotary at the flip of a switch and get up to 600rpm (some say 900, but I haven't used a rotary before, so i don't know).
Constant sound, no "clangy" metal sound like the pc. About the same weight as a pc. Detachable power cord. Able to use LC 6 1/2 pads if you already have them.
Cons: Runs pretty hot at rotary 6 speed. I actually melted the backing plate that came with it. If you need more correction than 600/900rpm rotary, you may need something else. Edge pads not compatible, although some adapter has been sighted.
Neutral: Proprietary backing plate. Very firm hook&loop backing. Sometimes hard to pull off the pad, but that could be a good or bad thing, depending how you look at it.
Thats just my observations. I have never used a rotary, so it was a pretty good learning tool. If I had a pc and rotary, I don't think i'd get the Festool. But if I needed to replace a broken pc, I'd get a Festool.