After seeing that video I did purchase some of the 3m xtract he endorses so highly. It is pretty incredible stuff, and very inexpensive. I won't throw out my boxes from klingspor but for sanding discs I no longer see any reason to buy anything else.
I did not know they even make the 3M in belts. Of course, just after buying a lot of Klingspor, which are good. I see the Shopsmith grey stuff did pretty well. I had good luck with it too in disks, but belts came apart. Never would have bothered with Diablo, but if in a bind, easy to get. 3M has some red wet-dry course grit sheets that works very well.
I have cubitron and xtract as well as Diablo mesh. Those are the one I settled on a while back.
With the Diablo mesh and the xtract, both do not perform as well as solid backing paper if you are sanding detail with ridges. Solid paper holds up better. THe mesh abrasive attachment to the backing will begin to fail. For that I use solid backing paper.
I buy my standard paper from my local dealer. Farris Belt & Saw uses paper from many vendors. They are converters also, so they can make any odd ball things I come up with. They also custom make bandsaw blades. They have hundreds in stock and can make up just about anything.
Taylor Tools, Katz-Moses, Amazon all sell the 3M Xtract Cubitron mesh discs. Taylor Tools sells both direct and via the Amazon marketplace. Amazon has been waiting to receive supply for its own store, with a touch lower pricing.
Nice study. The main advantage of the Festool sander is the amazing dust collection. I'll have to try the Xtract on it and if it still removes as much dust (and I assume it does or he would have mentioned it) it will be a real deal.