I have been using the rotary exclusively for about a year or so now and rarely have to reach for the PC. For the most part it's the softer clear's that present a problem for "hologram free" finishing. After compounding, a finishing pad is a "must" with the rotary. I personally use an 6" - 6.5" LC VCC black pad with either OP,
menzerna FP or my new favorite 106FF. After spreading at low rpms and polishing at 1200 - 1800 rpms, I will finish it out a about 900 rpms with very slow passes. It's the slow passes with low rpms that will produce a hologram and trail free finish. This is just my experience by the way. As far as pad size I like 6.5" purple foamed wool for correction work and 6" - 6.5" black LC VCC pads for finishing. I have some 6"CCS pads that I hate for rotary work because they are to hard. I also have some 8" Edge pads that I use on large vehicls once in a while. I find the smaller pads have better controll and feel.