What isolation feet under your amp with great result?

As a long time user of Machina Dynamica Springs (various sizes for various weight components) I am curious. When I went to the Ali-X page I like that they have a top and bottom, but did not see how much weight they can support
IMO, the springs are too small to deal with lower vibrations

Anybody?

My mono blocks are sitting on Grand Prix amp stands. Under the stand spikes are Herbies sliders, so the amps can be moved easily on carpet. But, I recently added some of Geoff springs under the amps sitting on the stand, and son of a gun they do add further to an element of isolation  and results in a slightly more open soundstage. 

ozzy

I like the springs (just like those by M-D) that I put under my amps so far, but I wanted to maintain a lower profile under my speakers so just ordered Herbie’s Giant Fat Gliders to try in the place of the Sound Anchor spikes.

@tweak1 I can feel the low frequency isolation with my hand. My speakers have separate cabinets for the bass and mid-range/tweeter pair, and the head units sit on top of the bass cabinets. With the isoacoustic pucks under the head unit, I could still feel bass frequencies when I put my hand on top of the head unit cabinet. With the springs I cannot.