Used to use a Porter Cable DA polisher until recently. Picked up a Flex XC3401 and have been really happy with it. Seems to have more power than the PC and a lot less vibration. Might be a bit heavier. Haven't really held each side by side.
For the current Land Cruiser project, have been using a host of products and pads.
Currently using an orange pad and Meguair's Ultimate Compound.
Started off with Chemical Guys V38, then V36, then V34, then V32 before going to the Meguair's. (yes completely backwards order on the Chemical Guys polish and compound, just wanted to start lighter before going to more abrasive)
I would say at this point on the surfaces I have down paint correction via compounding on, the swirls are gone. What I am left with is the scratches. Some panels seem to have less scratches than others. So either what I was doing there, I did well OR that panel had a lot less trail abuse over the years and miles.
Currently have a Swirl Killer Mini on order and inbound with some Adam's compound and polish to try out. So we will see.
The really really BIG challenge is finding the time to use the stuff and do the paint correction. Nights and weekends fill up quick.