I agree on the awesomeness of Cuben. I have had my hybrid Cuben Zpacks Zero backpack for almost a year now, and have taken it on many trips, a significant amount of the trips having bushwhacking involved. No holes, very few issues. I did have to replace a buckle on my shoulder strap, but I put it through more stress than I should have. I climbed down a cliff and then jumped down about a 2 meter drop and the plastic buckle snapped. Joe was nice enough to send me some more buckles and my wife was nice enough to fix it.
I also have a Zpacks solo Hex tarp and love it. Shelters should not ever come into contact with anything rough or sharp, just wind, rain, snow, and hail. I have seen a video on these forums before of a Hex in some pretty hardcore hail and it was fine. Anyhow, I have had my Hex tarp for over a year and have a hard time finding bad things to say about it. It has seen heavy rain and I was totally dry--as in, not a drop of rain on me--and very happy and cozy inside of it. Setting it up the first few times is tricky, but it's easy now. I may have to replace the guy lines, as a few of the knots have gotten messed up, but that has nothing to do with the Cuben.
There are some issues with Cuben, of course. There is no magic fabric for backpacking, but if you ask me Cuben is as close as you are going to get for a wide range of things. I think for backpacks, in general hybrid Cuben has no equal. A good argument could be made for thicker Cuben for shelters or even silnylon for certain situations, but for my needs and location the Hex tarp has been outstanding. When I need to replace it, which I am sure will happen eventually (as with most gear), I will either get a new Hex solo tarp or maybe take small weight bump up for a Hex solo plus tarp.