I have not used Isocups but I am very happy with the Tenderfoot footers.
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The iso-cups with the standard balls are outstanding. The veils lifted at all frequencies can be jaw dropping. I have them under all of my components with no weaknesses that I can detect.
I have found cones to not yield linear results irregardless of whether they are brass, BDR, Polycrystal, etc.
I see that Steve is now selling a new decoupling base for use with the isocups/ball. Looks like I need to place an order!!!
I vote for the isocups too. I use Symposium Rollerball Juniors as well. I think they are slighly better, but you can get about 10 sets of isocups for one set of rollerballs, no contest. I bought mine with the acrylic balls, I asked about the ebony ones and he threw in a set free. What can you say about that. I could'nt hear much difference, as Herbie suggested I would'nt. The Big fat dots under my speakers are pretty good. as for the tube dampers, I do'nt think you can find cheaper anyware.
I use 4 isocups, but I use a tube amp waying 55Kg
As much as I like the Isocups, I still think that the choice between the two can be system and/or component dependent. You might find that some components work better with the Tenderfeet than they do with the Isocups. The great thing about Herbies is that you could experiment and if you find that one of the products didn't suit your needs, you could return it under the 90 day return policy. Herbies is one of the best and consumer friendly businesses out there. Although still use the Tenderfeet in my system, the Isocups are outstanding. I haven't tried much of the newer cups and balls Herbies Offers, but I've tried the Gabon Ebony and the some of the Hardballs. My favorite was the Gabon Gyro, which used Gabon ebony wood with ruby ball sandwiched in between. The Gyro added incredible holographic 3-D imaging as well as other benefits to my system. The Gyros were discontinued but sometimes I've seen them listed in the Closeout section of the website, or you could ask Herbie directly. I've never been a big fan of cones, but I have discovered other isolation products that I am enjoying. Hope this helps answer your questions. By the way, Steve at Herbies will also give you excellent advice about how his products work and which one might be best for your needs.
I just installed Herbie's Audio Lab Iso-cups with Lampblack Balls with the new decoupling base upgrade. Using 3 of these under the CDP, Integrated Amp and Power Regenerator. Immediately noticed a deeper and wider soundstage, bigger 3D images, increased dynamics, smoother and more liquid midrange, focus and transparency improved. Cleaned up parts I didnt know that could be improved. This inexpensive tweak was well worth its price.