I heard the new D'Agostino Progression 800w monoblocks last night

Are these amps Class A or Class A/B?

Dan and co. never mentioned the topology, but given that they're stable and double power all the way down to a 1-ohm load (6400 W), weigh over 150 lbs. each, have 84 output transistors, and functioned as space heaters in the demo room, I'm inclined to guess Class A.

If I was so fortunate to be able to attend that event I am not sure how everything else would measure up after that.

That's why I always start with the Wilson room. Anything that impresses me after that has to have it going on. As it happens, I was also very impressed with the Audio Research/Magnepan 20.7 room and the McIntosh/Focal Sopra No.2 room. Personally, I liked the airy and realistic soundstage presented by the Maggie 20.7s. The Sopras were also very impressive for their output, transparency, and bass extension at $14K (same price as the 20.7s).

Goose, your impressions track with mine pretty well. I got to three of the four rooms you auditioned--D'Agostino/Wilson, ARC/Magneplanar 20.7, and McIntosh/Focal Sopra No.2.

I was probably making allowances for the D'Agostinos and Wilsons having no break-in, and the bass power was a bit overwhelming, but the room was relatively small. Ditto for the McIntosh/Sopra demo. Too much bass around 40 Hz, which again is probably room overload. 

But the Maggies, oh, the Maggies! As soon as music came out of them my emotional center went "Aaaaaaah!" So musical, so relaxing, so involving, with a very natural and focused soundstage. When I brought my humble 1.7s home two years ago, I noticed two things right away--how quiet Maggies are compared to dynamic box speakers (with few exceptions) and how the out of phase backwave helps cancel the room boom you get with conventional speakers. No bass traps needed.

The next day I played a fair amount of music at home, and even after hearing those great systems at Music Matters, my own Maggies and tube phono and line stages kept me happy and engaged with my system.

I do intend to experiment with placement a bit (mostly widen the distance between them) to get something akin to the soundstage I heard from the 20.7s.

How much are these amps for a pair of them? Did they the silver or the gold/black ones?

Believe it or not, the Progression is a somewhat cost-reduced product compared to the Momentum. They don't have all that steam punk styling and massive amounts of copper. The Momentum monoblocks are $50K/pair. On March 4 at the show I was quoted $39,950 for the pair of 300W Progression monos. 

As I said, the sense of unfettered dynamics with that much power and current on tap was amazing. But they weren't just powerhouses. They were also as sweet and subtle as you could want.

On March 4 at the show I was quoted $39,950 for the pair of 300W Progression monos.

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The Progression mono block amplifiers I'm referring to are 800 watts per channel, did Dan come out with another Progression amplifier with less power?

Nope. That first quote (from my post) was a total brain-fart mis-type on my part. I meant 800w Progression monos. And at the demo Mr. D'Agostino claimed doubling all the way down to 1 ohm (6.4KW each).