I have actually tried using maple platforms under my power amps. The setup was done according to Mapleshade's prescription: amp on brass cones, cones pointed into the wood, platform on damping feet (Isonodes in my case). I did not use anything bought from Mapleshade, since I was able to get equivalents locally or re-use stuff I already had.
The results were very good indeed. I enjoyed my tube amps much more after setting them up on the platforms. Midrange was clearer and harmonics more pleasing, and bass was better defined, fuller and more extended. Most important, the emotion of the performance came through better. First time I played my younger son a song he liked, he teared up, and that was when he first understood the reason I have a humble high end system.
Now YMMV as always, I have read comments from others who did not like the changes made by maple platforms in their setups, but in my case it was all to the good. I sold the amps those platforms were made for, and the platforms went too, but I will be getting another set for my new amps as soon as I can.