Re: Handgun Sights
It appears to me that the big trade off is between the rapidity with which one can acquire the target and accuracy. Since defensive weapons are intended to be used in emergencies, the latter is given short shrift in my opinion. So I think only Meprolight makes an adjustable sight designed for defensive use. And the XS "Big Dot" tritium sight is characteristic of those products which optimize acquisitian.
My personal opinion is that it doesn't matter how quickly you have to shoot, you're shooting at something, and it might as well be the target. As Erich is fond of saying, "shot placement is king..." So I like sights that at least have the potential for accurate shooting. The fixed sights that come standard on guns like the Sig 226 drive me nuts.
I've got an S&W revolver set up pretty well, I think, with an XS regular dot front sight (there is no rear sight on that J frame model) supplemented by a Crimson Trace lasergrip. It doesn't matter that it doesn't have an adjustable rear sight, since the thing is dead on accurate without it. But I tried to set up the Sig 226 with Truglo TFO set and that's been a disaster - I let a "gunsmith" put them in, and he neglected to tell me that the front sight I'd bought was a #6 and should have been a #8, and he busted up the fiber optic rods getting the things in. But it does have the CT lasergrip, so it does work, but I'm going to have to fix those sights.
Speaking of fiberoptics, I've got a Ruger GP100 with a Hi-Viz green dot in the front and a Bowen Classic Arms "Rough Country" white outline in the rear. As long as it doesn't get too dark, that thing is dead-on. Of course I had to remove the barrel several times to shave metal off the face of the frame to get the front sight to line up correctly. But I like that combination of sights. But that's an out-in-the-woods-defense weapon, not a stereotypical self-defense in the suburbs weapon.
I am a big fan of the XS tritium sights and of the CT lasergrips.