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.
