Yeah @sokogear, while with mc pickups you need to have enough gain, with the Londons and Deccas you need to have not too much (for low noise and freedom from overload distortion). In their Mani phone amp, Schitt Audio includes a gain setting of 33dB, specifically for those pickups. In their Andros phono amp, Zesto Audio includes an input impedance setting of 15kHz, specifically for the Londons/Deccas. They have quite a rabid cult fan base.
Grado has long offered both very inexpensive entry-level pickups and (relatively) high-priced statement models. I had a cheap one back in the 1980's, but have never heard their higher priced offerings.