Hi,
I'm not a dealer for Krell (but I am for Dan D'Agostino), but we did get one of the big iBias monoblocs in trade once, and they were indeed quite good, way, way better than I thought they'd be. For the price, hard to beat!
That pair actually went to a local gentleman who upgraded from Pass XA100 monoblocs. The Krell had more body, more refinement, more everything.
We do have a 2nd traded-in pair of Krell 575 monos, in the boxes, that I'll eventually get around to advertising here on Audiogon :)
cheers,
alex