The mouse is very nice and the blue track technology is great too, but the problem is that the nano transciever burns out after using it for a few days to weeks. This problem is clearly a issue with the design of the nano transciever. I have burned through 3 transceivers already.
My first mouse - used it for 1 month, but one day.. mouse stopped working.. when I touched the transciever.. it was burning hot. I yanked it out and the metal casing came off. It was not functional afterwards and heated up within seconds after plugging it in.
I called Microsoft for a replacement.
They sent me my second mouse - used it for 2 weeks. One day, I pulled the transceiver out and plugged it into another laptop. It didn't register. I then tried to pull it out and same problem.. It was burning up and the metal casing came off again.
Called Microsoft for a 3rd mouse.
I got fed up waiting for the mouse so I bought a Microsoft 4000 model on Jan 20th with the same bluetrack tech. I've used it for 1 month exactly and it just died. Same problem of the mouse becoming unresponsive and the nano transceiver overheating.
BTW.. for anyone that has this problem.. the mouse is under warranty for 2 years. You can call Microsoft at 1(800) 360-7561. Give them the PID number on the bottom of the mouse and they will send you a new one. Keep your old mice in case they ask for them. If everyone calls and gets warranty replacemetns, maybe they will finally fix this problem.