Hey Frank!
I was just telling John Doyle about them this weekend! He spent the weekend with us, and we had a great time "puttering" around the shop. When I purchased those belts, I believe I gave around $12 each, but your right, they are WELL worth it. If things go along as they are now, 6 of those belts will last be better than a year. I used them to clean up prior to heat treat, and then to begin the clean up after heat treat with them....I've lost track of the number of blades that I have done on a single belt.
The thought has crossed my mind......"I wonder how long one of these belts would hold up in a 50 or 60 grit for heavy work?" Even if a 50 or 60 grit were $15 each, they would be well worth it.