I'm almost certain NWD is cuben. The question is which variant. Normal cuben comes with varying amount of spectra and the outer mylar layers vary in thickness. For example, CT2K.18 means it's from 'Cubic Tech' and it has '2K' of spectra and the mylar is .18 thick (units?). Then there's all sorts of variations like 'high bias' (cuben on 4 angles instead of 2), wp/b (uses ptfe instead of mylar), hybrid cuben (part cuben, part nylon) etc.
IMO, the 1.5oz (CT5K.18) cuben is great stuff. It's far more durable for a pack than a light fabric like silnylon, while not being quite as durable as a more traditional fabric like 210D nylon dyneema X. You wouldn't want to drag 1.5oz cuben around on rocks, but with reasonable care it will last a very long time. Rodents can barely chew through this stuff. This is a good material for SUL packs and light frameless packs, but if you're going to go with a more fully featured and/or light framed pack then I'd probably opt for 210D nylon dyneema x for a few extra ounces. This 1.5oz cuben makes a big difference for a SUL pack when the pack weighs 4oz instead of 8oz, but it's not such a big difference when a 26oz pack becomes a 22oz pack because most of the weight is in features and padding.