The Mighty Mouse that comes with Macs are horrendous, mainly due to the low DPI and sensitivity.

With the Apple Mighty Mouse, you’d have to make large movements with the mouse to move the cursor just a little distance on-screen. To get the mouse cursor from one corner of the screen to the other, I’d need to make two or more swipes.

Not so with my A4Tech Retractable Mouse. Lovely little mouse. A tiny flick of the wrist is all I need to move the mouse pointer from one edge of the screen to the other. Pure bliss.