Seems like the transition started over a year ago with the 3M Pro sandpaper showing up on shelves. Given that it was ~30% more than regular sandpaper I didn't buy any (figuring it was a gimmick). But about the first of the year my local Home Depot basically did a full scale transition leaving only a few assorted packs of "regular" old sandpaper on the shelf. So I began buying some of this and have been using it for about 2 months now in earnest. I have to tell you, I'm impressed. It is more durable, which you would expect as it is billed as "Professional" but really the better thing is how when you sand it doesn't get clogged up. Better yet, if you do have a lot of "sanded" material in the grit all you have to do is use your finger and "flip it" a couple times on the back of the sheet and the material falls right out giving you a nearly new sheet again. I'm not a materials engineer and thus don't really know what they've done here? Maybe it is the grit material itself? Maybe the shape of the grit? Maybe a coating? I don't know the answers to the above so I thought I'd post it, but I can say "I'm sold."