@RayIN :-
I'm using an original MX Master, though certain utilities report it as an MX Master 2 (the Mk 2 was identical to the Mk 1, just with a higher DPI resolution). This is recognised perfectly by Solaar, which gives me almost as many settings options as the Windows software would.
I don't like the MX Master 3, the current top-of-the-range mouse. For my liking, the side-scroll wheel and the back/forward buttons are awkwardly positioned when compared to the older mouse. I've tried it out in-store on a demo machine, and I could see myself very quickly getting annoyed with it!
Logitech got the original MX Master more nearly perfect than they realised, I suspect. Despite that some folks rave about the Master 3 - for some people, newer MUST always be "better" (even when it's not) - I've seen plenty of reviews and forum posts by other folks who swear by their original MX Masters, and insist they'll hang onto them as long as they can.
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I picked mine up from Amazon at not much more than half its original RRP. For me, it was a good investment, considering how much use my mice get; this thing is comfortable to use for hours on end, and I don't get the 'cramping' that often affects me with many other mice.
Mike.