I put a set of Trijicon's on it and that is what I wanted. It is my main carry gun. I also shoot IDPA with it. I think for pure comp those HiViz are the way to go and when I finally get a dedicated comp gun those will be on it. But for carry being the main purpose I think the Trijicons will be the way to go. I can certainly use them at the range too.
As for check the HiViz in low light, I honestly think the factory Glock sights are better in dusk type light.