I was just talking to Chuck (coastal eddie) yesterday about the FLEX. I was telling him that I haven't even touched my Porter Cable or rotary in over 3 months. Don't see any reason to use them much in the future either unless I'm showing how to use one.
I experimented with using a purple foamed wool pad to apply my LSP (UPP) yesterday and it worked great. It left no marring, made the buffer super easy to control and did a great job of spreading it super thin.
Sheila helped me yesterday and she has never used a rotary or a FLEX. I wanted her to try it so I thought the foamed wool pad would make it easier for her. She did the whole car (Dodge Durango) all by herself just like a pro.
If you haven't tried that pad yet, I recommend getting one. You might find yourself using it more than your foam pads.