I've modded ToneZones, PAF's (the old discontinued DP103), Evos, PAF Pros, Air Nortons, Air Zones, Liquifire, Mo Joe, Utopia and almost all Airbuckers and more than I'd like to admit. All magnets came off easily, the only slightly gluey part was the magnet being held in place from the heavy wax-potting they do.
The biggest improvement for me was half-airing the Air Norton, Tone Zone and Liquifire to a point where they became sounding excellent - while being almost unusable for me before.
Anyway, I've never modded a SuperD, even though I owned many of them as I felt they were already as good sounding as it gets for that model.