Ryu trust me, there are several milliseconds of latency for the mouse to create the RF waves, send em out, and the receiverer to pick it up send it to the computer. I\'ve tried many other wireless devices out there and although this is the best one I\'ve used with its 125Hz sampling rate, there is still some latency I notice when gaming. And I use the 700 with the base 1-2\' away.
If it were games such as UT or Max Payne I wouldn\'t mind as much but for super responsive sniping in games such as Medal of Honor I have to use wired.
I read in a review somewhere, I\'ll check for the link later on if you need it, that you can actually boost the 125hz to something far beyond that even above that of the corded mouse. I\'m not quite sure how much of a difference that makes, but I\'m guessing for a reviewer to go through and not even mention lag after switching to that mode, it has to be something amazing.
Personally, as I said, I don\'t notice the lag in games since I don\'t use it for gaming.

I have my mx500 constantly hooked up since it\'s the one model of mouse I simply can\'t go wrong with. In my opinion, it\'s the best mouse out there to buy. Just amazing.
***Edit:
http://www.ownt.com/hardware/reviews/2003/mxvsmx/mxvsmx.shtmHere are the quotes I was referring to in the article:
Ucky USB and Hefty Hertz
So what hertz? Well, in this case, it\'s how many times your mouse is sending and checking the mouse\'s position on the screen. So, lets say you have a PS2 mouse and your hertz are coming in at 97 on an average. Let\'s assume for a second you have a top of the line card and are pulling out 150+ frames per second in your game. That means your video is drawing your screen more times than your mouse is refreshing its position. This is bad. You want your mouse to be at least as many FPS you are getting in your game. The higher the mouse hertz, the better. This is where the fluid mouse movement comes in. Let\'s first look at the hertz of the mice we are comparing today:
PS2 Adapter on USB Mouse: 97 Hz Average
Regular USB for both mice: 124 Hz Average
PS2 Adapter with Speedup: 195 Hz Average
And on the ps2 adapter speed up?
PS2 Adapter with Speedup
After enabling a speedup in Logitech\'s MouseWare drivers, the USB mouse with the PS2 adapter scored a whopping 195 hertz on average. This is the best score you can get. It peeked at 238 hertz, but for the average 195 was as high as it went. Gamers should take note that a PS2 mouse with a speedup utility will enable it to have more fluid movement than a USB mouse. As of the time of this review, we were unable to find any type of USB speed up utility that would increase the hertz of a USB mouse. Using a speedup program with the PS2 adapter is key if you are looking for the most fluid movement that a mouse can offer.
Speeding up that Logitech Mouse
While you can download a third party utility to speed up your Logitech mouse, it\'s recommended that you use the software Logitech has provided. After heading to Logitech\'s Site and downloading the latest version of MouseWare and installing it and getting a mouse icon next to your clock on your taskbar, simply double click the icon, click the motion tab, and at the very bottom you will see a slide bar that is defaulted at 100. Slide that puppy all the way to the right until it reaches 200. Hit OK, and you\'re set. This PS2 slide bar will only be there if you have a PS2 mouse connected, otherwise it will not appear in the MouseWare utility.
