Shannon, i use 2 different mops. One is an old 220 grit 4" mob with the paper about worn completely - I use this for between coat sandings on a lot of my projects when I am finishing them. The second one still is a 220 grit 4" mop but it is much more aggressive when sanding. All in all a sanding mop is in my opinion an essential sander to have in the shop if you are going to do intricate fret, intarsia or segmentation. It is good for all around as well.
DW