Given that the company that makes the ILS bought S&W several years back, I don't see the locks going away anytime soon, at least not across the board; and I am not surprised they might not want to publish stories of lock failures.
That said, I have not heard of many, and most of the ones I have heard about involved magnum recoil in Scandium guns.
I don't see a plus side to the ILS, though, and I dislike it both aesthetically and on principle. I sold my only ILS gun last month. All my S&Ws are older, or new but no-lock.