So far, i really like Tyvek overall minus the Dupont logo (i've only used the homewrap stuff). Here are some tyvek stuff i've made so far, tyvek tube tent (super easy to make, and i used tape), tyvek rain skirt, and i have some other projects i plan on using it for like adding onto a wind shirt i recently bought that doesn't have long sleeves, maybe a pyramid type tarp tent.
So far, i did have one or two of the pre-made tape loops break on my tube tent, but that's because both my wife and i were in it and it's only made for 1, and she rolled around too much putting a lot of pressure on very specific guy lines. However, in more normal conditions, i think these would hold up quite well.
I'm quite interested in seeing how long term longevity of the material holds up. My stuff is new and recent, so i don't have much of an idea about that aspect.
But yes, i'm also surprised why it's not more used or talked about--i understand the esthetic reasons, and the weight and compactness of the material, but considering how cheap, and durable it seems while being both waterproof and a bit breathable and fairly light, certainly light enough to fit into most UL type scenarios depending...yeah, can't beat it in my book. I wish i had discovered it earlier, would have saved me some money for sure!