LX700 user. 7 years and still counting. Never fail, except for the charging dock.

To me, Bluetrack is much superior in working on glass or any other surface besides mouse mats.

My complain on laser is they have trouble working on certain surface or cheap mats. i have no problem with optical but after shifting the upgrade to laser tech, makes me wanna switch back to conventional optical mouse. I have to admit for laser, you can work more than 2k cpi or dpi with precision. but in reality, we don't utilize much of this feature unless you have a super duper high resolution screen which requires minimal motion.