oh yeah i've read it somewhere that you can't use a Glossy White surfaces because too much light reflection will mess up the sensor hence it cud not track the surface well =)

that is why expensive mousepadz were engineered with precise roughness for better tracking.

i should know better because i'm a MOUSEPAD geek
I also avoid glossy mousepads since it would really mess up the pointer.

I use those that have a cotton wrapped mousepads.