The coverage is really very thin and transparent (not clear!). In daylight, they are less black than without, but that does not bother me. When writing I will have little or no limited, due to the thin material. The pressure point of the key remains the same.
It is particularly practical that I can leave the cover on the keyboard and the Air nevertheless suggests problems is. For those who have a iSaver: cover and iSaver together are too "thick" to connect the device completely.
I am very happy and I hope that I will long have some of the product!