Thanks for posting your impressions. I think I'll stick with the Herbie's stuff for now. My Uber sits on a hardwood floor. I tried some
Herbie's tenderfeet under it and really didn't notice a change in sound over the stock rubber feet.
I highly recommend EdenSound Terrastone platforms and isolators. Much more effective than maple platforms, much more affordable than the carbon fiber stuff. Really great. Symposium is very good too.
I've had good results with the EdenSound footers under my heavy speakers.
Don P.