I wish to give my first (couple-of-weeks) impression. I have the pair M6i+M6CDP interconnected by Nordost Red Dawn linear (not balanced) cable. I have never been a MF fan and never even considered to have a MF separate, but this pair was chosen as the best solution after I tried about 12-15 integrated amps in up to $4000 range. The problem to find the right sound was my 89db 8 and 4 Ohm speakers - they are very difficult to handle. I was looking for very mild and warm but still clear, strong and precise sound. I did front testing between many amps - Moon, Unison Research, Roksan, Marantz (series 15), Nad, Naim and several tube amps. MF was seconded by Moon and after this two the rest seemed to play garbage rather than music.
I liked very much very the bass of MF - it is not booming but is exact and precise. Midrange is pleasant and warm.
Had some trouble to find the right cables, I tested some XLRs (but in the shop, not in home) and I found line inputs are better. Cannot explain why, just liked those more. I picked Nordost since it deliver the exact sound - I guess the amp's warmth is better to be transmitted than hidden or obscured by cable's properties. Still did not pick the speaker cables, so that's for the future.
Now what I do not like:
MF6CDP is advertised as CD\\DAC. While I cannot say anything bad about CD part, DAC is lame. MF manual and the web-site is not saying anything about DAC input capacities. They just mention 192\\24 upscaling feature. According to my local distributor (in Russia) SPDIF and Toslink and USB can accept only 48\\24 digital PCM. Well, that's surprise! I keep some hope that they can be mistaken and SPDIF can handle more - but that I still have to test myself. USB indeed cannot accept hi-resolution. The reason that I found is the recently announced stand-alone DAC by MF. We'll see reports about that, but I believe MF limited M6CDP digital input capacity for commerciall reasons in order to make customers buy stand-alone unit. This is unfair. In my case I would not like to buy a separate DAC for playing computer audio files - the best solution is to find network digital music player like Linn, Wadia or PS Audio.