Cons: USB Receiver is not good at all - my mouse was less than 6 feet away and suffered from link and lag issues. Mouse beeps everytime you push DPI button - for pete's sake why? I bought a Logitech keyboard and mouse combo for cheaper, and that mouse performed 5 times better than this one.
Summary: The only thing I noticed the dpi switch does do is move web pages forward and back when surfing. That might be nice, but using the icons never bothered me. My standard old $20 non-gaming logitech's and MS were better for gaming. Guess I'll just get another of those.
Pros: batteries included
Cons: No instructions about use of dpi switch. No difference noticed when using it. Tracking not smooth.
Summary: no better than and not as comfortable as a standard non-gaming $20 logitech or MS mouse the surfing forward and back surfing feature may be useful although clicking the forward and back icons never seemed a hassle b4
Pros: comes with batteries
Cons: no directions, notice NO difference adjusting dpi, the only apparent change using dpi switch is that it moves web pages forward and back when surfing