Hey guys,
I just used the above combo and it's great for all the little nooks, crannies and awkward spots that a bigger buffer (rotary, flex 3401, etc) cannot fit in without doing damage.
I used this for the above bumper trim, the small thin pillars, and the area of paint (usually no more than 6 inches) above the door handles.
Don't throw away your
pc/udm, because for full correction jobs you're still going to need them.