I agree with the assesment Chris posted about the night sights 110%. Well stated and correct.
You can make them better by widening the notch on the rear some, it makes them faster to align but not much more precise. For IDPA they aren't too bad, closer targets and much lower hit factors generally seen make them more suitable. For USPSA I think they are a big handicap.
I prefer a .090" or narrower front sight with a .140" rear notch on a 5" barrel gun. Sometimes I think a fiber front sight is better and sometimes I think it is a distraction, basically whatever is on the gun feels like the wrong choice no matter what I use. I have about half and half plain sights and fiber optic. You couldn't GIVE me a fiber optic rear sight unless it was agreed that I would sell it at the first opportunity. In every case I feel that fiber optics in the rear sight are a distraction, just like the dots in night sights or standard sights. My rear sights must be plain, black, and plain black. Nothing else will work for me.