My 1911 Bobtail SC shoots great, but I have to ask S&W for a new sight. The earlier models shipped with a wrong front site post. Mine shoots way, way low -- yes, from a rest, too. Others on 1911 Forum have also discussed this problem, and S&W is sending out new front site posts. Recent Bobtail SC's have been properly fitted before leaving the factory.
I'm toying with what to do, as I may go for an XS Express Big Dot site, anyway. Otherwise, my gun has been flawless. The Scandium scratches far too easily, though. This will be my first, and last, Scandium. It's just way, way too soft.