We have tried them all-from monkey to klindex and beyond.
I like the Poly-pads plus,Spinflex pads in the 200 and 400 grit and Vortex pads.
All are excellent for honing applications. Poly and Vortex work ok on epoxy terrazzo when you burnish with the higher grits.
They are all different. The Poly pads plus are less aggressive than the vortex.
Spinflex are very aggressive and made for concrete- but I never used them on concrete
We seem to reach for the vortex more when it comes to travertine surfaces in kitchens or just those type of stones that are medium or high honed.
We found the advantage is you can replicate different finishes by going wet or dry starting with the number 1 pad.
Same with the polypads. Spinflex works well for knocking out picture frames and producing lower matte finishes.
They all are useless if you are trying to use them before polishing with a paste or powder.
The clarity is Non existent.
Our guys love them and they will increase productivity for sure. Same for the polypads.
We sell them both but have been using them longer than we have sold them.
So you might take this as a bit biased review since we sell them all but please don't.
I think you will see similar reviews by anyone who has used them.