Many people like the 3rd generation S&W autos, but they go to them as though the 2nd generation guns weren't ever in existence. I have several 2nd and 3rd generation pistols (including a 659 and a 5906) and I love 'em both, but if I had to l lose one, it would be the 5906 as I prefer the 659. I also have a 645 and a 3906, and the 2nd generation guns are just as reliable as the 3rd generation guns.
When the Model 59 was first introduced, I really, really wanted one. But they had horrible reputations and were called jammomatics. People didn't understand how S&W could make s such good revolvers but make such lousy autos. So I waited and bought an Italian Beretta. It wasn't nickel plated like the S&W 59, but they ate anything that fit into the magazine. S&W later fixed the problems, but I think the 2nd generation was the "lost" generation. Many people seemed to forget it even existed. The problem with the 3rd generation was similar to the Ruger rear sight issue. Ruger adjustable rear sights are all the same: the .22LR Single-Six has the
same adjustable sights as the Super Redhawk. And the S&W 3rd generation plastic grips are all the same!
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S&W 457 .45 auto has the bsame plastic grips as 3rd gen pistols.
If someone came up and offered to swap me a S&W 39 for my 3906, I'd trade in a heartbeat, because the 3906 has the same type of plastic grips as my 5906. I'd love to have some wood grips for my 3906. I don't know if S&W changed them to cut corners or for ergonomics, or both, but I prefer the 2nd generation. The Model 457 has them, but I don't know if it is a 2nd or 3rd generation pistol.
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S&W 645 is a great 2nd generation .45 auto.
The S&W 659 is a superb 9mm 2nd generation pistol that is every bit as accurate and reliable as the 3rd generation 5906, and it's a beautiful gun as well, and both take the same 10-/14-/20-round magazines. Oh, and the 6906 also is a great little 9mm that takes 13-round magazines, or all the magazines the 659/5906 takes. It's a truly magnificent little pistol with an alloy frame.
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S&W 5906
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S&W 3906
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S&W 6906, takes 13-round or 20-round mags.
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S&W 659