Not sure if I'm going to replace the Technics' feet, but I was considering brass footers from Starsound Technologies (Audiopoints), or the Isonoe feet.
I recently installed a sandbox under the Technics (designed by Thom Mackris of Galibier Design, and built by Timbernation), that has made an improvement over the Neuance platform I was using previously. The image is larger and clearer, and my perception is that the volume level is higher at the same setting on my preamp. That's probably not true though.
Anyway, the rig sounds great as it is, and I have no huge desire to change the feet, but I was curious about what adding brass feet might do.