I have fallen in love with Promark Milt Jackson mallets. They're unlike any other mallet I've ever used - huge oval-shaped heads, heavy weight but wound with soft yarn. They are supposedly modeled after Milt's mallets. But someone knowledgeable about vibraphone construction has warned me that these mallets can be destructive to an instrument.
He says that the weight of the large head on these mallets can actually ruin the vibe keys. I respect his opninion but I am also skeptical about this warning.
Does anyone have long-term experience with these mallets? Has anyone had problems with the mallets damaging vibe keys?