The keys make a very good impression and are for Mac prolific writer as made with the same stroke, although the buttons are a little closer to each other, which at first requires a conversion. But the German umlauts are at the usual place and are designed as full-size keys (unlike some other products). All buttons are located on the usual for Mac users location. From OS X usual shortcuts like CMD-X for Cut and similar work fine.
The keyboard does not touch the screen, as long as no pressure on the case will be exercised. When traveling in the trunk, for example this is the case, however, which is why it is then offered to put an extra thin cloth on the keyboard before you fold, to prevent scratching of the screen.
The Bluetooth connection works smoothly and reliably: we would buy the product again.