: I've been checking out the Klingspor site prior to ordering sanding disks.

I've had good luck with their heavy paper hook & loop, but the lighter paper isn't very durable. The backing tends to wrinkle. PSA might overcome this problem, but I'd worry about creep.

Being cheap I buy the 6" disks for my big Bosch and after the outside edge is shot I cut them down and use them on my 4 1/2" Bosch. The dust holes are the same. One benefit of hook & loop.