Having owned both, I prefer the M10. If you already own an Edirol, it'll be fine, but for me the M10's much higher battery life, internal 4GB memory, and (at least anecdotally) better sounding ADC takes it for me. Personally I'm pretty indifferent as to the layout of the two, but the M10s is certainly nice, and I like the "peak lights" for open taping as well.