A few photos of the M&P with "SeeAll" sight mounted, and some observations:
1. Installation was easy, followed Scottie Cox's excellent YouTube video.
2. The sight is mounted onto a dovetail adaptor that relies entirely on it's interference fit with the slide. It feels tight, but only time will tell if it's rigidity, ruggedness and accuracy will last.
3. Sight-in took around 30 shots; much more than they advertised. Of course my efforts could have been reduced had I read the directions and not inadvertently removed the windage spring cap from the left side, wondering why the POI wasn't moving.
4. Targets do not appear in the optic block, only the sighting triangle. Shooting it with both eyes open sort of fakes your mind into seeing the target with the triangle superimposed, but shooting with only the dominant eye open requires a strong 6:00 hold.
5. The sighting triangle was/is difficult to pick up quickly. This would likely be a hinderance for timed completion events.
6. Accuracy was definitely improved with the SeeAll sight. My best grouping at 15 yards was 5 shots within 2 inches from a rested position, also 10 shots within 5 inches off-hand (see photos). For me, that's about as good as I've done in quite a while.
7. With the sight mounted, the gun fit well in its original box, also no problem with it fitting into its holster, a Blackhawk Sherpa (...I know, I know).
Overall, I think that it's a keeper.