http://www.theanalogdept.com/spotmat_10.htm
I know I'm chiming in (too) late, but I've recently been using a variant of this mat on my P3/RB300/Denon DL160. It's slightly thicker than the standard Rega felt, so VTA will be affected. It avoids the static issues with the standard felt mat, and so far I'm happy with the sound and ease of use--compared to, say, the None-felt variants, which are tricky to use without starting & stopping the platter after every side. It's also super-cheap: a sheet of the foam cost me 36 cents, including tax.
Brent
I know I'm chiming in (too) late, but I've recently been using a variant of this mat on my P3/RB300/Denon DL160. It's slightly thicker than the standard Rega felt, so VTA will be affected. It avoids the static issues with the standard felt mat, and so far I'm happy with the sound and ease of use--compared to, say, the None-felt variants, which are tricky to use without starting & stopping the platter after every side. It's also super-cheap: a sheet of the foam cost me 36 cents, including tax.
Brent