Gammajo,
To be honest, I would need a chance to A/B the purpleheart feet with something else, perhaps my BDR MKIII cones. As soon as I do that, I'll be able to give a more emperical evaluation.
See, when I moved the new feet to the TP, I took the Walker Valid Points from the TP and moved them to under the Spectron amp. We also suddenly had high humidity conditions, which tends to have a noticeable effect on the Maggies. As you might expect, with three changes, it's hard to isolate what I now hear as...
...MUCH better sound. It sounds somehow sweeter - almost more "organic" - than before, as though there's a nice, soft, mellower feel to everything.
That said - and I will get back with more, later - I'm sure that I'll be keeping the purpleheart feet under the TP and the Valid Points under the amp, where they are now. Sounds good to me, and that's what counts.
Rob