I think it works great with the rotary. The 2.5 will break down much quicker with the rotary than by PC. I know that this is the case with most products, but 2.5 seems to be really fast.
I like to use SSR2 as well as 2.5 with a roatry, never tried 3, and have only used SSR1 with the rotary one time. I prefer SSR1 with the PC as a final polish.
I have always used all of the products with a meguiars polishing or finishing pad.