The 411 and the 915 were S&W's first attempt at an economy line of pistol. The lines on them are not as clean as the 4006/5906, they used some plastic parts in them that can be replaced with from the more expensive counterparts.
Everything I've heard about them is that they have the S&W reliability. You can use magazines from the 4000/5900 series pistols. Price on them when they were new was around $100 cheaper than the parent pistols.
Cheers,
Sam