Well, . . . first of all they're not '
colored sights'; they're illuminated (or glowing) sights. Second, they're not really '
night sights', either; they're low-light sights, instead. What is the advantage? Hmmm, . . . after 20, some odd, years of using these things (mostly Meprolights) I certainly don't know? In my opinion about the best of them is TrueGlo's TFX Pro '
Brite-Sites'; or, for those who prefer a smaller and less distracting front sight, Heine's '
Straight 8' sight set.
In my experience, I have found Meprolight's incredibly bright (and exceedingly large) illuminated sight sets to be, at least occasionally, way too bright to use for '
serious work' while you're in the dark–so to speak! The problem with all really bright '
night sights' is that they are designed to work best in consistently dim (rather than light 'n dark dappled) light. For instance I once had a target charge me from about 15 yards away. The movement was fast, and the target's background varied every few feet between inky blackness to various shades of reflected light–Some of it quite bright!
Well, I was so busy trying to focus on my brilliantly glowing bright green
Meprolight front sight that, as the target passed through varying shades of light and dark, it disappeared right behind my brilliantly glowing front sight–right behind it! If I had fired at that exact moment the shot would have been where the target had just been rather than where it actually was (a whole lot closer to me)! Consequently, for playing gun games or fooling around at the range I think '
night sights' are great; however, for serious work out in the real world, quite frankly, I'd rather not use them.
Oh, by the way, I've known plenty of gunmen who did just fine with an all black set of metal sights (often
Warren) on their Glock pistols.