I like Heinie Straight-8 better than anything I have had a chance to handle. Put one dot above the other, like a figure 8; simple and very quick. I have owned Glocks with such a set-up, as well as the factory set-up from SIG, whoever they use, and Trijicon products. There is nothing wrong with Trijicon, but their usual 3-dot pattern is not good for me, as I sometimes see an additional ghost image of the rear dots. Two of my revolvers have the Trijicon stand-alone front sight, which I like. Another set-up I had for a while was the Wilson Night Eyes, which seemed to work well. I have the most practical experience, overall, with Heinie and the SIG factory set-ups, because those are what I have used on duty pistols since 2002; I work night shift for a big-city PD. Before 2002, I used night sights on back-up weapons only.