My first few XS sights were Ashley Express. I'd put them on all my guns given the money and opportunity.

Some really don't like them but I sure do. Mostly cause they are highly visible in daylight, most night sights aren't that great in daylight to me. Don't get along good with fiber optic, just don't show up good. I'm color blind so I need to experiment with different colors, might be one out there that shows up better than what I've tried before.