I have the stickers affixed on the keyboard of my Sony Vaio. There is no overlap with the other characters (not even in the special characters). The stickers are slightly smaller than the Tatsten, but still large enough. If you have it installed but once, you can not (simply) gets it again. Correct is not so. But keep it be determined for ever. On the pad the label are all stuck in the correct order, but you should already consider whether they adhered to the correct key, the layout of Tatstaturen can already distinguish something (of anything between normal and laptop keyboard).
Negatives: The material is not completely transparent. One can see the edges and the film itself a bit, but especially where the stickers are on the original characters. Me personally disturbs a little, and also that they clearly feel when typing. The color of the characters is clearly not as intense as in the picture, at least not with those in light blue (I am referring to the image of each button). In black buttons, they can be not so good from the white original characters.