What are the pros and cons....I'd assume just cons...
Abralon, Siaair, Sandpaper, Scotchbrites are all viable options for surface adjustments.
Effectively there's no differences in the surfaces you can produce on a ball using paper vs Abralon.
Sandpaper is cheaper, lasts longer, You can get it in P-scale grit just like Abralon uses (US grit will work just look at a conversion chart).
if you want a soft back just hold a old abralon pad or sponge on the back of the paper.
If you get velcro backed paper it will stick on a CAB (Contour Abrasion Block).
The thing about abralon was it used the FEPA P-scale for grit and that uses a tighter production tolerance than US/Cami grit.
Scotchbrites are okay they last a long time, but you don't quite have the grit selection and don't cut quite as deep.