Given the option, I will take a countersunk slide stop, even though I don't believe the standard design has ever caused me a problem. I have felt them move before but I don't put my finger along the frame anymore so I don't think I'm at risk of issues... but if I have the option for the countersink I'll take it.
People with more credibility than me swear by FO front sights and don't have any problems with them.
I have personally seen about half a dozen launch downrange and won't use them on anything I expect to rely on.
In a course I remember Ken Hackathon saying that the Gold bead was his personal favourite front sight. I have never tried one but good enough for the chief, good enough for me.