I still have the older Festool abrasive discs with the FAR fewer holes and cut-outs in them, various obsolete versions like Brilliant 2 and others. Dust Collection is just fine with them. You'll be fine. When I compare them to my new style discs, usually all Granat, there 'probably' is a difference that if I took the time to measure out, I'd see. But roughly speaking, old and new discs, with the sander attached to a Vac, all work SO MUCH better than NO Vacuum attached