Works on surfaces where other optical mice don't - glossy surfaces, opaque glass, textured surfaces, wood, etc.
More exact tracking of the Laser Mouse compared to Optical Mouse The area used in tracking is more defined since it detects smaller changes in surface texture
Less power used with better low power and low voltage settings with the laser
More responsive to movements due to optimization to limit the lags and latencies
Possible Lower costs and better DPI in the future since the market for Laser Mice is increasing for mainstream users compared to mainly a Retail/Gamer market