I’m trying the other Herbie's mat, the “Way Excellent 2” at the moment on my Artemis in place of the hard acrylic one that came with it. The results are predominantly positive with more resolution and a better piano tone, particularly if I dispense with the 100g puck that benefits the acrylic mat. Timing doesn’t seem to have been thrown off at all..
There is a wide range of sizes available which works for me as the Artemis platter has a recess for the mat 3.2mm deep with an outside diameter of 292mm and an inside one of 105mm. Herbie’s were able to supply a size to fit wirh a thickness of 4.5mm, close to the 4.4mm thickness of my acrylic mat.
One Rega turntable owner, who moderates another forum I frequent, posted that the Herbie’s mat was a disaster on his P10 but worked well on his Thorens 124, after I’d ordered it I might add, so maybe it’s quite deck dependent.