I just got my udm yesterday and I got to use it today. Besides for a few mishaps like taking it off when it was still running and getting polish on some vinyl that still needs to be addressed I also pulled it off early cause I could see that the polish was drying I ripped a pad luckily it was an old pad that was quite beat. I need to use it more to know when to stop and wipe I also need more experience to know what polish to use but all in all it was great. It did not vibrate much it had power I was afraid at first of burning paint but quickly realized that I would not do that. It made a difference I did half my trunk and half my hood and you could see a great differance but not scratch free but much better. I have a BMW and the clear is strong. I think it is a great machine and I recomend it.
