I've had this for a few months now. I've a win 7 PC connected to a TV and if I'm more than a meter away from the PC I have connection issues: and I've got the receiver connected to the front of the machine. The keyboard can be sluggish or can repeat letters, either way I have to be very careful when typing. I wish it worked better; the form factor is great and its well built, the keys have a nice solid action, the D-pad is excellent and the track-pad is excellent. When its working its great, when it isn't its very frustrating.
I've a wireless Keysonic keyboard with integrated track-pad (purchased over 2 years ago) and its much better. If the Rii Mini was as dependable as the Keysonic I'd easily give it 5 stars.