Negative side: the trackpad, too small. Once tested the Microsoft Media All-in-One (yet much cheaper), it is impossible to return to the microscopic trackpads Logitech. The comfort provided by a large surface area is too large.
The biggest downside remains unquestionably the location quite absurd the left click button (found in general this type of keyboard HTPC top left to be able to hold the keyboard with both hands, the right thumb on the trackpad, the left thumb on the click): the click button, if practical, is in the upper left, but on the edge! What a stupid idea! It becomes very difficult to achieve (and I have big hands) and more pressing (poor quality), forcing to abandon this use (both hands) ...
For me, it was crippling downside ... and especially since this keyboard is three times as expensive as the new leader of the category of Microsoft. Bye Bye!