I have been using clear full body Skinomi Techskin on my iPhone 4S I bought as soon as it became available.
It is a great skin, and it definitely helps against drops (although you should go for a case if dropping is your main concern). The screen will less likely be damaged because even though it does not absorb shock it does strengthen the glass by a bit. And with this, you know that there will be no scratches.
One downside of it is that the adhesive is a bit weaker than some other films I've used. It starts to feel after a few months of use. You can, however, request lifetime warranty replacement for $2.95 (shipping charge) using a fax. They send the replacement very quickly, and I've done this twice so far.
Any bubbles that form under the film will disappear within a few days. Liquid bubbles disappear more quickly, so using a lot of liquid is fine as long as it does not damage the device. Unless there is a huge bubble, you don't need to try to hard to get rid of them.
Sent from my ASUS Transformer Pad TF700T using xda app-developers app