I have Ashley Express 24/7 Big Dot Express sights on my Sig P239. They're really good for fast combat accuracy on human sized targets, but not too great if you want pinpoint accuracy.
I may as well offer my two cents regarding night sights. Bottom line is I don't think they are worth the money. Not saying they are bad to have, or that they don't do what they say. They glow in the dark. But in my experience carrying them on duty guns for over 20 years, working late shifts in remote areas by myself, I never made any use of them.
You can really only see the glow well if you are in nearly complete darkness AND your eyes are adjusted to the dark. But then you can't really see your target. (Think Clarice Starling in Buffalo Bill's basement). So you'll use a flashlight, or weapon mounted light, which will then obviate the need for night sights. The light will constrict your pupils and you won't make much of the glow, and will just use the sight silhouette.
I find I am rarely in complete darkness. There is almost always some ambient light, from street lights, parking lot lights, store lights, etc. wherever you may have a need for a defensive firearm. I leave a living room light on at night, and light comes in through the windows from the back porch, etc. In those circumstances, it's very unlikely that you will need, or even perceive, the glow of your night sights.
So, if you ask me (which you didn't), I would spend the money on something else, rather than night sights.