I had the PC but moved up to the Flex awhile back and won't look back. Although the PC is good it can't beat the flex on some things.
That's true to a point, but the PC definitely has its uses. A good detailer will NOT limit themselves to one polisher as one polisher does not address every situation. Also, once your paint has been fully corrected to perfection, you should not have a constant need an aggressive polisher like the Flex. Issues may arrive which call for the Flex but the PC should be all you need after achieving perfect paint. The PC is all I use on my paint. After all, you only have so much clear coat.
Remember, to achieve and maintain perfect paint, you must be practicing a
proper wash technique and
proper dust removal. Without doing those two things, you will constantly be fixing your paint. That is not a good thing. All you have to do is think about it logically and you will see that it is nothing but common sense.