First of all, that is a great review and video. That is professional top rate production material there. I am soooooo jealous of your abilities in that particular area!
Secondly I have to disagree with the above comment. The UDM isn't a better machine than the PC just because it has lower vibrations. Functionaly it is the exact same machine. Other than the slightly larger motor, David himself will even admit that the internals of the UDM and PC are nearly identical. That slightly larger motor isn't powerful enough to produce significant results over a PC. I still believe that when it comes to those two machines, much of the result comes from the skill of the operator. Sort of like a fast car. A Civic can beat a Ferrari if the Ferrari is being driven by a moron. lol
Compare the UDM to the PC side by side after ten years of use and we'll see which is the better machine. I've got a PC, UDM, and a FLEX and look forward to comparing them side by side on a job similar to what was done on this review, but for now all I have to go by is my side by side comparison with the PC and the UDM. My UDM lies pretty much dormant on my shelf due to the little quirks that it has and due to the fact that my PC has proven to be more effective of a machine. Sure the UDM vibrates less, but the FLEX vibrates hardly at all. Other than for the little value I have in saying I own all three machines and being able to let people compare them side by side at my annual workshops, I strongly feel that the FLEX is going to eclipse both machines and be my absolute #1 go to machine for detailing this year. My PC belongs displayed in a place of honor in my garage while the UDM is one shelf away from the disgraced products shelf.