Makita BO6040 here with 6" Edge pad system. Everything I've read about the Porter Cable points to it's lack of power running a 6" pad hence my decision to spend $250 versus the $100 PC.
No looking back, you get what you pay for.
Actually, you could have gotten a better polisher for cheaper by going with the
Bosch 1250DEVS, which is significantly cheaper. The one you picked has a performance of 1600 - 5800 OPM, as compared to the Bosch at 3,100-6,650 OPM. The real cool thing about the Bosch is that it has a switch that changes the back plate from a clutched orbital (just like the PC), to a forced rotation orbital (just like the Flex 3401VRG).
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That puppy gets real nasty when you throw that switch and rivals the work that a rotary will do. It is dangerous in the hands of a novice but since you can switch back to the clutched mode, you can gradually work your way up to the forced rotation method.
I wouldn't put either one of these polishers into the hands of a novice because of their aggressiveness but hey, that's one man's opinion!
Now the PC is not that bad! I work wonders with that machine.