xs sights imho they are the best sights for defense. they are quick on traget and accurate too, regardless of what people say. it is very doable to hit 100yd pepper poppers with em. they are great for shooting on the move, weak, strong hand, as well as shooting at moving targets. they are bright day and night, and will really speed up your first shot time.
they do take a little getting used to for people that have been using 3 dots thier whole life but they are well worth the time spent getting to use them. personally it took e no time at all and i was running and gunning in no time with them on a glock 19, which i wasn't a fan of the glocks but those sights on that gun and i fell in love.