Not sure what you mean by longevity as its not likely to wear out. The frame is made of plywood with a square aluminum tube screwed to the back that pinches the screen material between it and the wood. The long piece of the frame is split in two pieces and bolted together this is the weakest point and some people have complained about it sagging in the middle especially for larger screens. Its fairly well built but I sure I could have done better my self if I had the time. The cinewhite material is a heavy vinyl that has very little stretch and is 1.2 gain, I would say very good quality. If you move it around a lot I would say it would not hold up well but once mounted it should last forever if not physically damaged by unforeseen forces. Check out the other Jamestown forum and there are pictures and many discussions on it.
"Smart enough to know better, to old to care" ------ Dedicated Home Theater, Mitsubishi HC7900DW Projector, 110" 16:9 Jamestown screen with variable power masking for CIW 2.50:1 to 16:9, Marantz 7009 with 7.1.4 Atmos with Ohm mains,3 DIY Subs (2 15" (1 ported, 1 sealed and a 12" 4th order bandpass), 1 DIY butt kicker, Custom Built HTPC, 10TB DroboFS NAS