I have a mx 700, and I have to admit it isnt perfect for gaming as people always seem to say. While its great for office work and light gaming, when it comes to FPS, there is a noticeable lag when playing certain games, especially when mouse acceleration and mouse smoothing is off. And the cordless keyboard also has the lag, especially when multiple repeated keypresses are used.
One more thing, logitech drivers are piss poor. Compared to microsoft drivers, they have many, many problems. The first thing, is that mouseware does not have program specific key presses. Secondly, you need to download an extra utility to make use of logitech's "game detection" which doesnt work half the time and has no advanced configuration whatsoever. Also, there are many incompatilities with the extra buttons and certain games. Some work, some dont.
There is freeware software called logigamer that attempts to remedy some of these problems, but it too doesnt work half the time. It crashes randomly, and outright stops functioning after a certain period of time. At some times the buttons dont even perform their labeled action. And the program detection is pretty weak; as it only detects if the program is running, and not if its in focus, which is important.
Anyways, the mouse is still incredible for a wireless mouse, and the setup is pretty nice except for the problems I mentioned above. However for even moderate FPS gamers, I think you should look for a corded mouse such as the MX5xx or an intellimouse explorer.
If anyone has any solutions to any of these problems, please post.
-Steve