5/5 on quality and speed. I have 2 Orbital sanders the Ryobi and a tacklife. Both use this size and 5 hole set up. the Holes lined up perfectly with the vaccume holes and the grits lasted so far very well. I have used the 80 up to 240 on a single table that i stripped and sanded down. it did not gumm up like alot of the disks do. Long term these seem great. One can never tell with this sort of thing but time will tell. lokoing forward to continuing to use these and have a new supplyer to use.