Marantz PM Ki Ruby vs Musical Fidelity M6si

@corelli.. thanks again. Just checked out your photos. What a beautiful listening room you got. 
Wish I had a dedicated room. Mine’s a living room setup so you can imagine the whole host of acoustic problems I am having to deal with. Next up, I want to do some basic treatment but I have to make sure that my boss (wifey) is happy with the decor.  Lol

Thanks for your kind words.  A dedicated room is a huge plus.  But don't despair.  Great sound can still be achieved in a living room. (An understanding spouse goes a long way in this situation)

Ruby owner here (integrated first, followed by SACD player): I’ve been extremely pleased with both pieces, but especially the amp, as I’ve shared in other posts here & on Hoffman’s board.

I did not audition the MF; I’m sure it’s a fine unit.

To summarize, I find the Marantz open, fast, non-fatiguing, with a very good phono section & headphone amp. A little while back I switched in an old iron lung power cord (and a new Amazon sourced hospital grade $15 power cord); I continue to shake my head as to just how good this thing sounds. Believe I’m in for the long-haul with this one, I can squander my $$ on other things now...

Looking at both Rubies together as a system, the convenience of a common remote to control the amp & silver disc spinner has grown on me and girlfriend; she’s comfortable using and enjoys listening to the system. (Think long-term, big picture here..) I can use the DAC in the SACD with a streamer. Food for thought, esp with the prices on the amp coming down.

Hope this helps, feel free to pm me with any questions.

@p3ga thanks for the detailed review. Funny enough, I have a very similar setup. I use the node 2i for streaming but is hooked to a marantz sa8005. I bypass the node dac and what a pleasant difference it has made. Everything is so much more musical and non fatiguing.
I’m fairly clear about the ruby but I’m also getting a decent deal on the PM 10 (still considerably more expensive than the ruby).
Have you had the chance to try the pm 10 by any chance? Is it worth the extra dough or should I stick with Ken’s last work of art with marantz ?

I did not try the PM-10; at the time I was looking, I could not justify it at full tariff, so it never entered the thought process. I'm confident that it offers some advantages over the Ruby integrated, especially at the price delta between the two. I might, however, need to spend a retirement-postponing amount on speakers & peripherals to appreciate the difference between the two.

I hope you have the opportunity to try both and would be interested in your findings.