I have heard a lot of hardcore PC gamers say that wireless mice are bad for gaming and they have $100 wired gaming mice that makes gaming "so much better", but I'm not sure if they are serious or just trying to justify their purchases or seem better than everyone. I play with not only a non-gaming wireless mouse, but a wireless keyboard from around 2006 and have no issues with input lag or anything like that. My question is, if I upgraded to something like a Razr Deathadder or some other "gaming" wired mouse and a "gaming" wired keyboard, does it actually make a difference? I don't think I will be, but I'm curious, because I don't notice any lag on my wireless stuff now. Thanks for your input!
Personally, as a wow player, I use a microsoft sidewinder keyboard(for the extra macro buttons on the left side) and a cheapo wireless Logitech mouse. One of the advantages of having a gaming mouse is the amount of buttons you can use for attacks or spell casting or whatever, also the ability to program macros into the mouse to do certain things. If you are a casual gamer, most likely those things wont really necessary for you, and might take a lot of time to get used to( I tried a few different gaming mice, and the reason I didn't stick with most of them was the big difference from the"normal" mouse type that I've been using for about 20 years) But it basically boils down to personal prefference. Try a gaming keyboard and mouse out, and if you like it, use it. If not, you can always return the item or sell it on ebay or something.
Depends on what kind of games you play, on FPS games (First person shooters) those 10ms+ of latency wireless devices have can make the difference between you killing the enemy or him killing you, in other games such as MMORPGs ones that won't be noticeable at all.
There's also the plus of extra buttons and macros like jeremy said, however I think there's already some wireless models with all those features.