noticed dekoni pads are a bit thick than stock sundara - i bought sundara nice and early when it was introduced in US so it is possible my original pads are a bit worn though certainly not falling apart or torn in anyway.
i feel that these dekoni pads probably make sundara sound closer to harman curve. if you enjoy bass and note weight - these are right pads on sundara - will tame some brightness too.
i did enjoy a slight brightness in sundara and perception of clarity. this appears slightly gone with these pads
the good- increase in bass and weight of notes.
these pads did change sundara's sound for me. with brightness slightly tamed, sundara now sounds even more neutral than stock pads.