I'll step in here and offer my two-cents, since no one else indicated a familiarity with SeymourAV:
If the screen material is the same as their DIY screen, this will be about the best screen out there, acoustically. It also is a much finer hole spacing, which means you can sit closer and not see objectionable hole patterns. The audio performance is excellent, making this one of about two truly acoustic-transparent screens on the market (and the other company uses similar if not the same material).
I built my DIY screen with this material and it is excellent. Even with a spandex black light blocker behind it, the sum total attenuation is inaudible. Even my friend Ethan Winer, who eschews any type of AT-screen because the established ones have poor audio performance, was amazed at how truly 'invisible' it is, from an audio standpoint.
I highly recommend this. Chris Seymour is a perfectionist and makes certain the product is flawless when it leaves the factory. And it performs as well visually as it does acoustically.