I have heard recently a FM acoustic system (amp and also their new loudspeakers)at a dealer. Was nice, but overpriced. Heard on the same day a Spectral+Magico Mini2 combination at the same dealer: I found the sound much more involving. FM sound was a little bit cold to me (heard also the Magico Minio with Spectral and with a FM acoustic amp on different day, the SPectral sounded better in my memories... but difficult to compare systems 3 months apart).
At the end, I bought a Dartzeel amp: I am feeling much more involved by the music than with Spectral or FM Acoustics, and I don't lose anything on transient speed.