I installed the King 3-dot sights. The rear sight dovetail was a little too big for the slide, so I had to file it a bit. I did manage to scratch the slide and the sight a little (on the right side, so you can't see it in the picture!), but it wasn't too bad. The original front sight didn't want to come out, but after a little work I finally got it free. Installation of the new front sight was pretty easy with the staking tool.
The sight picture is MUCH better than it was with the factory sights. Now I just need more practice!