The M80s have maybe a slight bass emphasis that's more noticeable at higher volumes, but the presentation and separation are surprisingly sophisticated, so it doesn't get in the way of the other things.
Got the V-80s. Gonna be burning them in for a while of course, but so far, they sound pretty smooth, slightly bass heavy, with a fairly good soundstage for a portable.
Have been used sparingly. Still in perfect condition. Will come with all original accessories and box. Price includes shipping to US only. PM me if you have any questions.
Thanks for looking