Well folks, I just got back from this demo and I can see what all the fuss is about. The caveats are that I was not sitting in the sweet spot and the room was a bit small for the Alexias (I believe) but the D'Agostino stereo amp and preamp with a Bricasti front end and Transparent cabling all terminating in the Alexias was quite a combo. There were 20 people or so smushed in a small room so that and not being in the sweet spot prevented me from being emotionally engaged with the music. Plus it was Peter McGrath of Wilson playing samples of his excellent recordings but pieces of music not familiar to me that also kept me from being really swept away. But here's what I heard and it was all very impressive:
1. Crystal clear/transparent midrange. Resolution on these babies was out of bounds
2. Pristine and extended highs (in contrast to earlier Wilsons which were a bit peaky for my taste, the soft dome tweeters on the Alexias were just right)
3. Bass was extended and punchy. I think there was a bit too much bass-room interaction because I think on bass heavy music, the bass was not as tight as I would have expected and maybe a tad blurring of resolution as a result
4. When you add all of the above, musical timbres were spot on (vocals, piano, horns, percussion, etc... all sounded natural and accurate)
5. These speakers are dynamic as hell. And I am sure the D'Ag stereo amp had a good hand in the delivery of macro dynamics as well
6. The speakers definitely presented images within the stage that were full bodied (3D in the sense of meat on the bones)
7. Overall staging I did not get to fully experience properly again because I was not sitting in the sweet spot
Overall very impressive combo. Fit and finish on both the Wilson and the D'Ag gear is right up there with the best.
For any Alexia owners on AS congrats. For all you D'Ag owners (Joe and Shane and others

), congrats as well.
Both Dan D'Agostino and Peter McGrath were super nice guys and they know their sh*te that's for sure
Hope this gives you a decent sense of what it was like being there. Here's a crappy iPhone pic of the set-up:
View attachment 2031
And finally, for anyone in the New England area who has not dealt with Fidelis, Walter Swanbon (founder/owner) is a very good guy and eventhough I have not had any dealings with them (yet

), I would heartily recommend him and his team at Fidelis.