After much research and Comparative wireless keyboards, I chose this one. I admit that at first I was a bit skeptical but I thought that the obligation not to buy batteries was still significant. After a few minutes of use I have been conquered: design level already, I find it really nice (they could have made an effort for a key to not score in any letter "Backspace" but ...). I agree with some comments about the keys: they are less quiet than on other keyboards but personally I find them really comfortable to type. Regarding the Caps Lock notification, volume changes etc, they are displayed directly on the screen as long as you install the appropriate software from the Logitech website. Overall I was really pleased with my purchase and hope to keep the long -très- :-)
PS: Be careful though from illustrations: the keyboard that I received is indeed a QWERTY !!