I just bought my used (but clean) 6-shot 6" 617 for $485 about a month ago
The previous owner was apparently some sort of Igor or something because I spent most of my first range session with it resetting the sights for humans so I don't have any stunning group photos to show you just yet but from the bench I was able to get 2 or 3 rounds at a time forming one ragged hole at 25 yards. Mine has a very smooth, fairly light DA pull and an absolutely EPIC SA pull - there simply is no better, and that's exactly why I, a die-hard fan of automatics, had to have an S&W Revolver for my .22 target/plinking gun. It's gorgeous and very solid feeling to boot and believe me when I say recoil is positively non-existant on this beast.
I love it, I absolutely love it, and if you get one chances are you will too.
EDIT: Mine's a pre-lock aswell, even though my picture seems like the trademark "hide the lock" photo, it's mostly because the room I had on the table facilitated that shot.