Hi,
I use a Naim Pre / Power combo with Montor Audio RX6' and imho it sounds superb. Definitely not warm sounding but it has wonderful clarity with no harshness whatsoever. I tried lots of amps with the MA's and the Naim was the only one that could control the bass properly.
I have an Arcam DV135 as a digital source and can sound lovely when fed a good quality cd or sacd but I think it really shines when using the Gyrodec with a well recorded lp.
I listen to all types of music and and I think it works well with whatever I play on it.
HTH
Steve