Clean sounds wonderful but is better when he turns it up. I can hear just a hint of weird phasy fizziness when he turns the power right down on lead channel. To be fair I get this with my DrZ EZG when I put a pdeal through it and turn the Airbrake down three clicks or more. Seems to be common with attenuators or Powerscaling to me (I have a Plexi50 and DC-30 clones with London Power Powerscaling), this fizziness when an amp is throttled back too much.
And for every Lance Keltner who can make an amp sound very good indeed theres one of these who can make anything sound very average http://www.youtube.com/watch?v=GzyQR7KnCco