I'm actually going to agree with the OP on this one, I do like the combo of Pico + Sennheiser (HD600 in my case).
My Pico drives it sufficiently, but more to the point, the tone and presentation of the Pico strikes a nice harmony with the intrinsic musicality of the HD600. I would go so far as to say that Pico + HD600 was a more synergistic combo than M^3 + HD600, having owned both rigs.
Now, balanced HD600 out of a balanced M^3 was an entirely different kettle of fish...
Edit: I wouldn't go so far as to call Pico > HD600 'Magic', though, as I have heard them better. Namely balanced.