I've used a cuben Patrol from MLD a huge amount since late 2008, mostly in New Zealand in the South Island. Probably several hundred nights all up, I really should have kept a log. Lots of hard and continuous rain, no issues, no leaks aside from when my initial seam sealing sprung a couple, which was fixed with another round of sealing. Folding doesn't seem to cause any apprecible wear that I can see so far. I do have some (5?) very small pinprick holes from either camping too close to fires, or conceivebly rolling the tarp up with sticks/twigs/stones caught up while all my weight is on it (maybe you can tell I haven't babied this thing). Practically they don't affect the waterproofness though, otherwise I might bother to repair them - I only began noticing them when the moon was above me at the right angle one night. So far I can't see why it won't just keep going and going, the guylines are wearing out long before the tarp itself is.
With the Patrol I also bought a cuben bottomed MLD bivy, which was a custom order. I wasn't sure how it would last, but I've been impressed - it's looking a bit tired in the head area but it's still serviceable. I use it on top of a foam pad (on the outside) which helps protect it and means leaks are less of a problem on very soggy ground. Most of the wear probably comes from only using a fairly stingy torso length pad which leaves the head area directly on the ground, which is often where my elbows and knees end up putting a lot of weight and wear on it. Using a full length pad would make it last longer. Having never used a silnylon bivy I don't know how tired one would look after the equivalent use (probably also pretty tired), but I'll happily buy another cuben bottomed bivy when this one wears out.
I've also used a cuben stuff sack from Granite Gear since they first came out. I found the sea to summit silnylon ones leaked (during all day rain, and during some swimming with a pack on), so switched to polythene bags. But I didn't like continually buying and throwing these out, and the lack of durability always made me nervous, so was glad to switch to the Granite Gear cuben bags. Never had a leak, and this includes during packrafting.
Besides the weight, I love the small packing volume and the fact the material absorbs no water, unlike silnylon which can wet out.
It's interesting reading about some of the lab tests, and I hope they go on, but I wouldn't hesitate in buying any cuben gear because of them.