Hi Tech Legion posted a review on the Razer Lachesis 4000 dpi Gaming Mouse

The Razer Lachesis gaming mouse is a USB wired 4000 dpi laser mouse designed with gamers in mind. The Razer Lachesis gaming mouse features on the fly sensitivity adjustments, as well as an impressive array of buttons, including two main buttons, four side buttons, two top on the fly adjustment buttons, and four way scroll wheel. The Razer Lachesis has a 4000 dpi laser with quick response times and smooth sensitivity settings.

I had switched to controllers several years back because the mice just couldn't provide me with the accuracy and response I was looking for, until now. The Razer Lachesis 4000 dpi mouse has really pushed the envelope of gaming mice with a strong product that remains responsive and accurate through all dpi and sensitivity settings. The Razer Lachesis is a phenomenal mouse that is well worth the $79.99 fee for admission, with a full feature set that will satisfy the most demanding of gamers.

Razer Lachesis 4000 dpi Gaming Mouse Review