I also love the way my main system looks as a whole. Individually, maybe not so handsome but when lined up, all the colors and the similarities of circles etc. looks appealing to me.
At least I haven't heard any difference in sound quality. Theory also says they shouldn't since the aim here is to prevent minor vibration coming from the ground and an amplifier shouldn't create vibrations of its own as a speaker, with movement of drives. Btw, not visible but each amp is standing on a 20 kg / 44 pounds marble and adequate set of Isoacoustics feet.