The display film came in packages of two incl. Very detailed installation instructions. I made the attachment exactly as directed, but it is a very fiddly work and with the first film, it did not work properly. The films are in fact really fit and since it is already on 1 mm shift - since the border of the smartphone is slightly elevated, forms the film when it rests on the edge, bubbles, which can not be pushed away. While there is, one, the film can easily be cleaned with water and then use it again, but I have found no way to get the film after dry again: the adhesive side must not touch it with a cloth (otherwise remains again sticking dust) and if you would let them air dry, then can come in this time to the film again dust particles. So was the first film for training purposes. In the second film it worked right away and I was able to apply without bubbles.
By Displayfolie there is no impairment of the touch-screen operation. It feels a little different at first, but you get used to very quickly. The film is in contrast to the bare display less prone to fingerprints and dust - they must therefore less often brush.
I can only recommend the display of mumbi films! The Assembly is indeed tricky, but doable with a little practice :-)