What isolation feet under your amp with great result?

Also @mitch2 those footers are the same ones I'm reporting on... They work great.

Having watched some of the Townshend demo videos and experienced the benefits of iso acoustics pucks, I'm with @rixthetrick on the benefits of springs. Given the pure mechanical nature, I went with the Chinese solution on AliExpress: 
https://www.aliexpress.com/item/32953238126.html?spm=a2g0s.9042311.0.0.69914c4dryN2ld

$38 for a set of 8 reasonably attractive and apparently well-engineered spring isolators. Springs are removable so you can adjust to the weight of your component. Still waiting for delivery, but I bought 16 and am planning to isolate the entire system. Assuming the quality is consistent with the store reviews, that's not bad for < $80. 

For people interested in trying other footing solutions (like ceramic bearings) without taking a big financial hit a this store has many other popular footer solutions: https://www.aliexpress.com/store/group/Foot-pad-LED-Volume-Display/3630068_513630114.html?spm=a2g0o....

You might drop an additional $30 on the springs from that Amazon link Mitch posted, since you’ll be in demoing mode anyway. Based on my experience, I think they’ll outperform the oreas, and if not, it’s a cheap experiment.

@nonoise I should say that it's unclear what change adding under my equipment did.

I installed everything at once, noticed the change in speaker balance created by loss of bass response, moved the springs up under my head units, and then enjoyed the best sound I've had in my system.

I trust the science behind what I'm hearing on the speaker end and do believe that they're helping under my equipment.  I'll be leaving them in place, but don't feel motivated to do an A & B. It sounds great as is...

I just got my Chinese spring footers in yesterday ($40 for a set of 8: https://www.aliexpress.com/item/32953238126.html?spm=a2g0s.9042311.0.0.69914c4dryN2ld). They are a substantial upgrade over the iso acoustics pucks I'd had under my Coincident PRE head units. If you place your hand on top of the bass cabinets that the head units sit on, you can feel the vibration of the woofers. These units completely decouple the head units from this vibration, the pucks did not. Imaging precision has increased accordingly.

I first tried placing them under the bass cabinets instead, but got a pretty striking reduction in bass output. I'd forgotten that the same result happened when I tried out isoacoustic feet as well. I think the dual 12" woofers just benefit from having a more solid launching platform. So, a word of warning there. 

I also put my amps and preamps on springs at the same time.  Clearly the big effect is from isolating my mid-range & tweeters, so I don't know if much changed from doing the equipment as well (everything was already on cheap rubber & cork vibration dampening squares). That said, the effect was so dramatic for the speakers that I'll definitely do the entire system... Especially at $40 for 8 footers.

@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.

Indeed. Everyone shopping for these solutions should use that to tool. Good recommendation.