TheTechLounge posted a Laser Mouse Roundup - they tested 5 different laser mice from the likes of Microsoft, Razer and Logitech.

Right out of the gate, err umm...the design gate, Razer and Logitech leave Microsoft in the dust. Microsoft's boring designs and bland color schemes will do nothing to entice gamers to jump on the MS bandwagon. Ergonomically, the Microsoft Wireless Laser Mouse 6000 is much more comfortable than its wired companion. The sculpted sides and thumb rest feel more natural in my hand than the ambidextrous design. Non-stick feet are nearly non-existent on both models and don't glide as smoothly as the other laser mice. You would think that with all of the money Microsoft has, they would be able to spend just a little bit of it on R&D to come up with some product designs that are at least on par with the competition.

The Copperhead wins the award for stand-out design, at least visually. The blue LED waist-line wraps around the body and shines like liquor store neon while the lighted wicked triple serpent logo pulsates like a viper ready to strike. Simple black is tough to beat. The big primary buttons are easy to find but I found the thin design slightly uncomfortable in my large hand. Smooth gliding isn't a problem for the ultra slick gray Teflon feet. The neon blue LED stripe is helpful in providing extra finger grip, but can get annoying during long frag sessions.

Logitech makes no apology to left-handers with their rightie-only G5/G7 mouse shells. Despite that, these mice were by far the most comfortable to me. The large non-stick feet glide effortlessly across my mouse pad and my hand fits nicely on the body. Visually, I found the G5's rusty battleship facade to be more to my liking than the aqua and silver two-tone of the G7. Logitech now offers a carbon fiber-look G5 mouse as well.