I've been very happy with my MF x10 v3. I've listened a lot with and without, so I think I can give a pretty good impression as to what it does, at least to my system. I'm using an arcam cd73 hooked to a NAD c352 amp with Wharfedale diamond 9.5 loudspeakers and hd580 headphones. I'd have to say that the x10 tube buffer doesn't add much coloration to the sound (my arcam sounds like it should). However, it definitely adds soundstage depth and perception across the sound field. In other words, I hear more of an even 180 degree sound field and I can place instruments close or far from me better with the x10 hooked up. I guess I'd have to say that imaging is quite a bit better with it. Without it, I lose the soundstage "magic" that it adds and the imaging. I'm not sure how it does it but it is really obvious. I listened to it hooked up for about a week - listened without it for a week, and then went back. It's definitely better with it hooked up. As for color, I don't think it really changes the essential sound of your source component. I'd say that it amplifies it's qualities and adds some soundstage and imaging magic to the equation.