Had a chance to try out a SIS on a misty, foggy day. The little bit of moisture collecting on the slide made the swirly SIS grasping "grooves" (grasping letters?) very slippery. I can't imagine anyone choosing those over standard serrations, or even the fish scales if you have to have something different. I didn't say better, just different. The square notch on the rear sight does make sense for single hand slide racking. Oddly, Richard Heinie made the world's best rear sight that also featured a "racking" notch, and had to go to a smoother slanted style to keep the masses happy. You could likely train yourself to use the SIS slide, but I can squeeze a hand strength meter off the scale, and still had some slips in quick TRB drills, something I have never had happen with the dozen or so 1911's (Colt, Para, Kimber, Les Baer, Springfield) I currently have on hand. Michael wrote about the trend to create new cosmetic variations just to have something new for the market; this one does seem to fall into that group.
At the same time, new out of the box, it functioned 100%, printing right on top of the front sight at 25 yards with 230FMJ, just to give credit to the part that really matters.