I just went around with the DA machine selection.
Save yourself the trouble, get the Flex ( if the money is available ). You will have a great unit that can do more defect removal than a PC, Griot's or Meguiar's machine. It does cost ~ 2.5x more.
I had a PC that was "liberated" from the work shop to use on the vehicles, replaced the shop unit with a Makita BO6040 6"
2010 I started looking for a replacement, the PC7424 was ~ 15+ years old, and felt like it was going to come apart in my hands ( it did quite a bit of work in the shop before changing roles and I had been through 1 set of brushes on it ).
I got the Meguiar's G110 ( not the V2 from the SN ) and I was less than impressed with it. It did not seem to do any better than my old PC. The G110V2 might be better, but I think the reviews on the G110 were from the name sake only, had nothing to do with someone owning both as active units in the same condition. The G100 was just an OEM'd PC7424.
I started looking again, and in DEC-2011 decided on another PC ( the 7424XP ) to replace PC. I made this decision due to an incorrect thought that I was going to change to the Lake County 1 Pad system. Found out after the fact, those are really for rotary machines, so I made a goof ( I needed the backing plate to be removable - RTFM on my part ).
I went back and compared getting a Rotary with a Dynabrade selectable orbital attachment or a Flex.
The Dynabrade you can stall the pad on, where the Flex you cannot, it has a forced rotation to the DA action.
The Rotary function, if need be I can use the Makita BO604 in rotary mode ( it still has some DA mode to it in rotary mode - which I am staying away from until I get some experience on a test hood or 2 ), and even though the flex is about 75.00 more than the rotary ( good one ) and Dynabrade option, I still went that route.
The opinion ( non expert ) from someone that owns a PC ( 2 - the old standard 7424 and a 7424XP ) a Meguiar's ( not the V2 ) and a Flex, get the Flex.
If the Flex price tag is a bit high, save the $ and get the PC. From the hype around the G110, I personally don't trust the reviews on the G110V2.