TrustedReviews has posted a review of the Logitech G5 - Gaming Mouse

Unlike the MX518 which used a super-sensitive LED to achieve a staggering 1,600dpi, the G5 uses a laser to achieve an even more impressive 2,000dpi sensitivity. Just like the MX518, the G5 can be configured using Logitech’s SetPoint utility. In SetPoint you can configure five pre-set sensitivities which can be adjusted on the fly, making it simple to have different settings for different weapons during gameplay. This also makes it easy to drop down the sensitivity when you’re in Windows, saving you the frustration of barely seeing your mouse pointer as it zooms from one side of the screen to the other.

Logitech G5 - Gaming Mouse Review