D'Agostino vs. Ayre

What are the sonic differences between the D'Agostino Momentum S-250 stereo amp and mono 400's? Khrys posted that he preferred the treble of the S-250.

I haven't had a chance to listen to any D'Agostino amps but my Ayre Ax-5 Twenty is the best integrated I've ever heard. Better than most separates. Btw, I also own several other Ayre  products and the guys over at Ayre are great. Just like anything else in audio the correct speaker match is a must. The Ayre amps in my opinion is especially good with Vandersteen speakers.  

Why are the Ayre amps good with Vandersteens? Are the Vandys darker? Does the illuminating quality of the Ayres compliment that?

I have Vandies hooked up to Atma MA-1 and MP-3 and couldn't be happier. Perhaps it is the Zero feedback? Johnny R at Audioconnection seems to think so...
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I would not considered Vandies dark.  The Treo CT is in my opinion mostly neutral with a touch of warmth..smooth.  With that said, the Ayre, just makes my Vandy Treo CT sing  :).  It just makes it sound musical and natural.  I can listen to the combo for hours at a time. The AX5/20 gives me a feeling that I'm listening to a tube amp but they are not.  Each note is separated and can be heard clearly. The bass is clean, tight and solid.  Lastly, the soundstage and imaging is one of the best I've heard, in this price range.