I've finally got around to fitting mine. The first thing to notice is that despite the item image, the protector does not have a cutout for the light sensor. Luckily it does not seem tol affect the functionality in any way.

A few more points:
* It sticks using electrostatic force, i.e. no glue and hence no residue upon removing
* It is ever so slightly smaller than the screen, leaving about 0.5mm gap all the way around.
* It is very smooth: the friction pretty much disappeared altogether
* It is also very clear and seems to actually increase the contrast
* Sadly, it does not hide already existing scratches on the screen

As mentioned above, good to treat as disposable. I won't be too upset if I have to throw it away after a few months.