I have a Logitech G5 mouse with optional weights. I read a study awhile ago (sorry I don't have a link) where it was found that the lighter the mouse the faster users were able to respond to on-screen stimuli. I guess that makes sense since there is less momentum to overcome. I was just curious if anyone had any insight into any benefits that adding weight might produce, or if it's just a matter of preference. I do use the mouse for FPS gaming btw. Thanks!
The idea behind using extra weight is so help you keep from over shooting your motions. With a lighter mouse your initial reaction may be faster but you may not have the friction desired to proper stopping and need to backtrack a little to correct the aim thereby negating the speed gained from the lighter weight.
Again it's all preference. Some people top just fine with a light mouse. Others prefer the kinetic friction.