Stewart seems to be addressing a problem which they have had for many years, but I'm not sure if they've come up with a solution which will draw a ton of business considering the alternatives.
Draper & DaLite have both delivered their screens for far less money and offer a full compliment of options on their screens including a large selection of screen materials and screen options to consumers in standard as well as custom sizes.
Stewart has the ability to deliver non-custom screens for exhorbinant prices, but those screens are amazing in quality and can be built when other manufacturers just can't deliver. But, when it has come to standard sizes, like a 120" diagonal 16:9 screen, Stewart has traditionally been about twice the price of the Draper/DaLite products, and far more than the cheaper options out there. Most notably is Carada which delivers a minimal gain white screen for less than half of what Stewart charges, yet seems to deliver nearly the same quality in their white minimal gain screen as anyone else out there, including Stewart, is capable of achieving.