A great write up thanks!
I have a PM Mk1 in a box somewhere. I would have got rid of it, but I know that at some stage in the future I will find a use for it. If nothing else, the ability to ‘auto-sense’ a line-in input and use this to automatically turn on Beolabs will be useful. I can imagine using this to connect a non-B&O TV to Beolabs, for example.
The main downside for me is the lack of Airplay 2, but I suppose this isn’t really a problem if you connect it to a main room masterlinked source.