Well, I just hung my Curved 150" screen last night. First impressions are WOW what a great screen. The Precision frame is the best, easy to put together, the corners match up perfectly and the velvet is as black and rich as anything I have ever seen. The XD screen itself looks great, I don't have the sound system hooked up yet so I can't comment on how well it passes the sound.
Buying this screen was one of the best choices I made in building my HT, worth every penny I paid for it.
As a note to the masking topic, I used the best black speaker cloth Parts Express sells to cover my screen wall. All I can say is that it looks gray compared to the velvet on the screen frame. I don't think you would be happy with the look if you used this for masking panels.