invisible switch / socket  

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Are the switches completely invisible? If so, is that really an ideal design?

soft light
The site says there is soft white light cirkle visible at night.
This ain't a good switch for public building; but I think it's ideal for the minimalist dream house.
Or even for a historical building.

The longer installed, the easier to use, I imagine--
just look for the grubby area on the wall, where hands have searched in vain for the switch! 🙂

dirty fingers
dirty fingers indeed
you'll have to repaint that button each year 😉

Not to belabor a point but....
The switch is certainly more aesthetically pleasing than your standard switch plate, it is certainly not grubby-fingered-kid friendly!
However I think this is step in the right direction towards more minimalist wall switches and outlets.

lithos
I think the switches by belgian company Lithos were the first good step; but the Niko ones are better.
http://www.lithos-sb.be/functions/content.asp?Pag=7&pnav=;4;9;