A Wilson rep gave me a two pack at Demo Day and I was able to play them last week. I really, really like this ball. There are a lot of claims of greater distance with them but since I didn't measure any drives I can't really say for sure if I hit them further or not. But I did make consistently long hits with driver and irons.
I also love the sound they make coming off a club. It's a substantial "thwack!". I found them to be very controllable, low spin off the tee and they seemed to like doing a little baby draw. Short irons and putting were very satisfying. The Duo checked up nicely and felt great coming off the putter.
I guess I'd say the Duo feels sort of like a Callaway Big Bertha Diablo but with less spin and a better sound coming off the clubs.
I'll be buying some soon.