Update:
Due to popular demand I purchased UTTG last week and tried it. Much less viscous than CG NLTG. Surprisingly, this made it a bit more difficult to apply (it didn't leave a thick, dark trail like CG NLTG to see where you've been) and didn't spread as far (needed more product to cover the same area. After applied, the gloss is about the same.
Unfortunately, direct durability studies are not underway (they are on different cars). Sorry. I applied UTTG to my year old Hyundai (with perfectly new looking trim) so I'm not even sure I'll be able to tell if it wears off.
Overall, it seems to be a very good product. Hopefully in the near future I'll be able to try it on a car with a bit of faded trim to see how its restorative ability goes.