A very positive experience with the Herbies Way Excellent 2 compared to the Linn felt mat for me. I have a 2mm that Herbies recommends for the LP12 so no measurement issues. Makes a much better connection to the platter which I suppose is how it tightened up the sound nicely from bass through top end.
The Linn felt mat would often lift up when removing a record and I’ve always been worried that it could catch the stylus. The Herbies stays put which is great.