Well, many years ago I owned some Audio Note UK amps and DACs, and also built some ANK kits (Canada). IMO the kits are dire quality, and you can do better. They seem cheap and seem to offer a saving on Audio Note UK products. Sadly almost nothing is the same, and 90% have zero designed involvement from Andy Grove. The OPTs are made in Canada for example, the PCBs designed by someone else.
As for the Mentor, that was designed by someone with zero connection to Audio Note.
Don't be fooled my friend. Look for a better brand, and buy used if you have to. Sorry, not want to sound negative.. PM me if you want more info.