I'll back up some of the other responses. I have them on my Bodyguard .380. VERY quick sight acquisition. They are not as accurate at the range, because of the design. It takes a lot of concentration to get the same accuracy as the factory sights, because it's too easy to be off just a little bit with that rear sight line.
But this isn't a range gun. For a self defense gun in low light, where you'll be at relatively close distances, it's a great choice. It's frustrating at the range, but I'm keeping them on the gun. The good outweighs the bad for me.