Indeed, the magnets do produce a vertical field which can affect a MC cartridge. However, it is possible to reduce this field enormously through a bit of careful design. I use three approaches; 1st the magnets are positioned relatively distant from the upper surface of the platter, 2nd the number of magnets used is quite low, 3rd a disc of mild (not stainless) steel is used to shield the cartridge from the magnetic field (this disc is also relatively distant from the surface of the platter. The platter is entirely levitated and the tip of the bearing no longer makes contact with the thrust pad in the main bearing. I cannot detect any issues with using my Troika and tracking eight is unaffected. No doubt the Naim ARO has many critics but few would deny its low friction/stiction levels.