Here's what I ended up with after about 45 minutes of trial and error. It does look cool, but I had to do it piecemeal — I've tried it maybe 10 times now and never gotten both lips to go on completely.
I really like Glitzy Lips, and they were fun to wear, but I do have a couple of concerns. The application is clearly kind of difficult, which means you might run out of foil before you actually get the lips you wanted.
The other issue is that, because the adhesive in them is water soluble, they dissolve pretty quickly. You shouldn't eat while wearing them, and if you drink, you'll need a straw, because otherwise they'll crumble off.
Since they're still such a new product, I imagine they'll tweak their formula in the future, which would be good. With a few adjustments, this could be an awesome product.