Greetings,
I have Bar-dot, Meprolites, and Trijicons. All work good and are similar in brightness. I have damaged at least one rear sight in each example. It is too easy to break an ampule installing them with a wood, brass, or steel drift punch. Either use a sight pusher or get someone who has one to install your sights. When the ampule is broken the sights go dim to dark in as little as 24 hrs. One set was dim for a month before failure. I have had two gunsmiths damage front sights on 1911's installing them. The slide MUST have a flat where the sight contats the slide or it WILL fail. For a 1911, I recommend having the manufacturer install the sight. For a Glock, be sure to use the pusher (Which Brownells sells.) Properly installed sights will be bright and last a long time from all the manufacturers. :D