I have a P7 and have tried various mats. I have not tried the Herbies. I went back to the Rega felt mat. My biggest concern was getting a mat the same thickness as the felt mat due to VTA non-adjustment on the Rega.
I'm also using a Herbie's Mat with my Rega P9. The thickness does not have to be an issue since they are available in different thicknesses. You can call and talk with Steve and he'll send you the correct mat. It did not affect my VTA on the P9. Using it with a Lyra cartridge. Level, to a bit low on the rear of the arm seems to do it.
Also, I just noticed that the web site is recommending the "grungebuster" specifically for the P-9. That's new from a year ago when I bought.
Steve also offers a 90 day no-risk trial on his products and a lifetime warranty.
Herbie's "Way Excellent II" mat works wonders on my Rega P3-24. To my ears, a very noticeable improvement over the Rega felt. A great "bang for the buck" tweak, and I believe there's a trial period, so you've got nothing to loose. Good Luck, and Happy Listening.
I am also using the HerbieĀ“s Lab Mat in my Rega P9. The sound improvement in my case was just amazing. Better details, transparency, tigher bass...and it looks really better than the origal one.
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