I have used screen protectors before and they have always been fiddly to put on and had bubbles etc. I don't know why but this one went on easily ans I can not notice it/ So much so that I gad to remind myself if I had actually put one on the other day, but yes, it is still there after a few months of constant use and not noticeable.
Ordered this item recently and was very pleased with both delivery time and quality of the actual screen protectors. Great fit for the S100 and the protector does not impair the quality of the LCD image. Cheap and simple to apply, what's not to like?