New Jovian Thunderbolt got his gunsmith to install XS Sights on his 1911 Commander and has published a range report.

The rear sight has no notch. Bit of a sway back. You might wander that big front sight around in that shallow saddle and not line it up with the post to make a perfect lollipop. Also, that front sight is BIG. It covers a lot of the target. You aren’t going to aim at a bad guys left eye and decide against that and shift to the right eye when he’s 20 yards away. You know what? I’m not good enough to do that anyway. So the problem the sights present are a bit moot.