I have the Mayer phono stage as well as the companion 801A line stage and have 300B monoblocks on the way next week.
The sound is transparent, dynamic, smooth and totally silent of background noise, even with the 76dB gain of the phono stage.
Each piece is hand made by Thomas and the layout can be changed as needed by the buyer. For past phono stages I have had Coincident, Allnic 3000, Herron, Cary and many others. I see no neded to ever swap out the Mayer stuff for any other.
The Elrog tubes are also produced by Mayer. He bought the factory last year when the tunes had quality issues and now they are fabulous.