The Logitech LX8 is a cordless laser mouse. Its contoured sides make it ambidextrous. The mouse is a wee bit larger than average, and it's a bit heavy at the rear, too. The contoured sides have a rubber-like covering to provide a good grip.
The scroll-wheel is four-directional. It can also be clicked to enable universal scroll mode or any other function
There are two programmable buttons at both sides; these can be configured using the software
Unfortunately, while the button on the side of the thumb is easy to click, the one on the other side isn't. This was probably done in order to retain ambidexterity. I did try to use it from time to time, but eventually gave up altogether.
Other than the laser sensor and the connect/power buttons, there is the battery compartment (for two AA batteries)
I didn't feel any lag at all; it worked pretty well, like most Logitech mice. I also tried playing Counter-Strike, and it seems like it's pretty usable for some casual gaming as well. I just wish it were a little lighter.
most comfortable ever - try the microsot ergonomic 4000, nothing beats it.
also if u want the fastest one - try Razer Lycossa, 100% increase in type speed and is the only Flat keyboard i have ever liked. i persnoally own both, after trying and returning many other including this one, that its undoubtedly the best out there.
also ergonomics and design should be talked about in the keyboard section.
also talk about the Macros, and key sensitivity and range of the keyboard (since wireless)