I tried the (approx.) 4" ones on my Cyclo and I didn't like them at all. I forget what I was using, maybe 1Z Metallic Polish, but they started shedding "fingers" rather quickly and they didn't feel soft enough for *ME* to want them touching my paint as a near or final-process applicator. They sure didn't FEEL as soft as a foam finishing pad to me!
If anyone wants my other set of 4" ones I'll sell them for next to nothing.
Note that, per usual, this is "just my opinion/experience", but *I* am gonna stick with foam.