Ball mice are
not dead. The original poster asked which was the best mouse for FPS gaming, not which required the least cleaning, which had the best warranty, or which had the latest
gee whizz optical technology. I provided him the answer, the Boomslang is the best (read: most accurate, responsive) mouse for gaming.
You could easily argue some rumored build quality or ball mouse cleaning issues with the Boomslang, but you can't say it isn't the best mouse for gaming. It is better because of the way it forces you to hold it (finger controlled, not arm) and it doesn't suffer from the tracking issues of the opticals, some people say "oh, they don't have those issues anymore", I call B.S. on that. I've yet to use an optical that doesn't suffer from some kind of tracking issues, be it hardware or software related, the simple fact is they have issues. I have three Boomslangs, and have either owned or purchased and returned at least 5 opticals (various versions). Not a single one of the opticals even was in the same ballpark as the Razer mouse. If I could use a $40 dollar mouse that required no cleaning instead of a $100 that did and get equal or better performance, believe me I would be glad to save the ~$60. I will say I have yet to try the logitech dual optical, but I expect it will be not much different.
As for the usb issue, I'm not really too concerned with a usb mouse dragging down my XP1900+

, but for those that are the Boomslang comes with a ps2 adapter and includes a ps2 rate adjuster built into it's software if you care to use it.
Opticals suck....(at least for now

)