For my Sony Xperia SP I had already bought another brand of membranes to protect my screen that turned really mean, fingers not well slid and the film quickly took force to rub marks in my pocket. So I came back to this brand one I had used for Xperia Arc S and for which I have never had a problem and in the end I think I'll keep this as a reference supplier.
Easy to install, 5 spare membranes if missed, fingers glide well on the touch screen, easy to clean, and above all it does not scratch, for my Xperia Arc S the film was still almost new after two years and did not take off.
