Once I grasped the concept of the long throw machines, it was easy for me to dial in the process. I went from having 8mm to 12mm. The machine also ran smoother, and was more robust in it's delivery of power.
I went from using a machine on speeds 4-6, to using a machine from speeds 2-4.
Imagine your pad still, no rotation. Imagine that stationary pad being moved over the paint 8mm, 12, 15, and 21. Almost like hand sanding in a straight line (but in this example it's in a circle). Now imagine that pad starting to spin. That's a lot of movement compared to what I was used to with the 8mm PC (which I still love). Even though I only went up 4mm, that an extra 50% motion for me.
Pretty good idea from those guys in Italy. I mean to design an entire line of tools around that concept is pretty ingenious, and it actually works as advertised.
Right now I'm pretty happy with the Duetto, but I imagine once the Mini, and Nanos are acquired I'll round out the rest of my outfit with the 15, and 21. I've really been taken with Rupes. Not just the tools, but their proprietary pads, and compounds. Really top notch, high quality products.