I now have 400 rounds through the gun and can give an interim report. I love the gun and the way it shoots. I did not have to mess with the sights at all. At about round 300 yesterday, about 40 rounds after last cleaning the gun, I had a light primer strike with a 124 grain handload. It fired on restrike. I have not chronographed the load yet through this gun. I do get very occasional light primer strikes with this ammo in other guns due to a weird batch of Winchester brass from some WWB that resulted in bad primer seating, but I cannot say that this event was not a gun problem. I ran 50 Blazer Brass through it today with zero functioning issues, including some prone at 100 yards. I shot some strong hand only and weak hand only yesterday with my handloads with no issues.
I do think that the gun is slightly undersprung. If the gun is empty and I retract the slide a little bit and release it, it will snap back into place. If I do that with a round in the chamber and a loaded magazine in the magazine well, it is sluggish and does not regularly return to battery. This is more noticeable if the gun is dirty.
I also have some uneven wear marks on the lettering on the right and left sides of the barrel, and some "chatter" marks on the left and right edges of the barrel hood that may need a little more wear-in.
Sig already could have done a rolling change to the recoil springs. My gun is a very early model with a July 11 "born on" date on the box. I am thinking that the additional weight of optics could further impact the ability of the slide to return fully to battery.
The gun worked great with all of the factory ammo I have run through it, and I have no concerns about carrying it. I hope to break out the Labradar sometime in the next couple of weeks.