What stopped me outside the price that I had read on some sites specialized as the mouse had the defect BE between sizes or large (such as M510 or M560 I own) or small as those wrongly dedicated the laptops. So when the Fnac to put together 54,90 I made the move (sorry Amazon for infidelity).
The keyboard, absolutely great, some do not like, if I, the keys feel and respond, programmable function keys and the default position, the control screen replacing the lights of old (would have benefited from more contrast). If you never had a password problem because you did not know you were in capital or digital locked, you can not understand.
The mouse is so great that I have installed on my laptop and I transferred my M510 mouse M560 on my lap with this new keyboard (the unifying thank you). The logic being that I use my laptop more than my tour I n''utilise than for storage and video conversion. Indeed this mouse is very plump falls perfectly in the palm of the hand, and also very Cossard, I was able to program the pressure on the roulette double-click (not on the M560).