I've only bought three "new" S&W's in my life. The most recent was a 9mm Shield, when they first came out. I'd never even heard of them when the guy at the LGS showed it to me. Nice little gun but I'm not a fan of any semi to tell you the truth. I really don't know whey I bought it. I kept it a while, then sold it for about what I paid for it.
Before that I bought a Sigma 9mm when I thought the security company I was working for was going to upgrade to "armed". They didn't. I sold the Sigma again for about what I paid for it, but it wasn't a bad gun.
The first handgun I ever bought was a NIB Model 19. I traded it off for a Colt 1911, also NIB, when I got bit by the IPSC bug. Last time I ever traded a revolver for a semi...although the Colt was a good gun too.