I have heard the Fono quite a few times.
Detailed and refined and plenty of stones when needed.
Very musical rather than very 'hifi'. You don't get holographic stereo imaging larger than the room but then I have only only heard it with a P3-24/TT-PSU and Denon DL103 (and Rega Elys 2).
Definitely a noticeable jump from the Fono-Mini in terms of refinement though.