Summary: The trackball in this thing is only 200 DPI. and it's a pain to browse windows with it. And the keyboard requires line of sight to the receiver. I mean it has to face the receiver straight on or it won't work ughhh. And the receiver has the activity light on even when i'm not even touching the keyboard or trackball. I think that's eating up the battery. Battery life is horrible. After 3 months of use, i have to struggle to move the cursor with the trackball.