Klingspor is the best value for me. I have been woodworking for 30 years and have looked for all those years for the best, and have settled on klingspor. And you might consider for your next birthday present, or for the next shop present, to get a Fein orbital sander, whopping 500 bucks and it is the best tool I have bought in a couple of years. The sander has turned the big job of finish sanding the epoxy on a 14 foot open canoe into an hour and a half, using 4 klingspor 180 disks...the red ones, velcro, 6 inch. Use the vacuum on the sander and the dust is gone and The shop central vacuum works great on this tool using only a 25 foot, 12 dollar plastic hose from Home Depot. I don't work for either of these companies, I build canoes for a living and the time investment is the major investment. See ya David Barrett