I have always used PSA discs for a disc, or in the case of the WS 3000 a plate sander. I guess I am thinking H&L would cause too much "give" and in the end that would affect outcome.
Maybe it's just because I haven't used it I have this fear? I do know that for my WS, I can't imagine wanting any "give" on a chisel's cutting edge. So I don't think I'm inclined to swap.