I own a S&W 4566TSW as well as 2 4566's and 2 4506's and 1 645.
My 4566TSW has 8,943 rounds through it and has yet to fail. It will feed anything given to it including a magazine of shell casings. It's accuracy at 25yds offhand is 1.75" while my other 45 series guns run at 2.25" at the same distance with the same ammo. Overall, I'm more than pleased and wouldn't hesitate a second to purchase another of this series. S&W may be on the dog list with gun owners, but they can make a gun, well, discounting the sigma line, but every maker does make a mistake every once in a while.