I am in the process of decided on which machine to get, the PC, UDM, or the Flex. I know that threads pertaining to these machines have been beat to death, but I am unsure which machine would best suit my skill level. I have never used a machine polisher before but I am familiar with different waxes and polishes. I plan on doing a lot more reading on the process of machine polishing before I attempt to do some paint correction. My only fear is buff trails and holograms. I know the PC and UDM are practically the same machine, but is the Flex more hard to use?