David,

I think the King sights are like any other modification done to handguns, some people like them and others don't. I think it would be worth more to the right person.

As for me, I do like them! I have one King sight package on a 1948 M&P, but it is the Super Police Night Sight package and not the nicer and more expensive ribbed target. I didn't pay anything extra for that one, in think partly because the gun shop didn't know what it was.

If you like it, get it. That's just my opinion.