I bought the Verizon (Non-privacy) screen protectors, which in my area were a 3-Pack for $12.99. Had perfect success with the application, and the protector is completely invisible. Touch sensitivity is exactly the same as without it. I have done many screen protectors and they do take a certain "technique" to get them to go on perfect (and stay on). Here is what I do:
1. Wash and dry your hands to remove as much oil as possible.
2. Work in a well lit environment (kitchen table for me).
3. Have a credit card out and handy.
4. Clean your device using the provided cleaning cloth. Make sure there is not a single speck of dust, dirt, lint, etc.
5. Remove the "STEP 1" bottom protection mask. The film is stiff enough that you can hold it from the edges similar to how you'd hold a DVD. DO NOT TOUCH the sticky side at all!
6. Start at the top (near the speaker opening) and very carefully line up that edge, allowing only a 1/4" or so to actually stick down. At this point you are eye-balling things and can still easily pull up that little section and realign if needed.
7. With the short side of the credit card, start at the top (where you have the 1/4" stuck down) and now follow it all the way down the phone with steady, even pressure. Sticking down the rest of the screen protector.
8. Using the credit card still, start in the middle and of the screen and smooth air bubbles (there shouldn't be very many) towards the edges. Work your way from the middle towards each edge until things look totally clear.
9. Carefully remove the "STEP 2" masking, making sure that the screen protector is not coming up with it-- and don't worry if you suddendly see a few bubbles.
10. repeat the credit card smoothing process from the middle to the edges until all bubbles are gone. Use your hands as well in the end to firmly press every inch. If there are any stubborm "micro-bubbles", press down on them directly with your thumb and let the heat from your thumb warm the plastic film a bit... this usually makes them disappear.
At this point you should have a totally invisible, long lasting protector in place.