Like super good to me, use them for 1 month for. Fits comfortably in my little hand, relatively heavy, a compact, comfortable grip. Reacts super, at the bottom has an on / off switch. The receiver I find mega convenient because it is very small, it is not even 1 cm from the USB slot out, we overlook him almost and the notebook fits well with the receiver in his shell. He's so elegant small that it does not interfere.