The most envied attribute of both, to me, is that spring-loaded front sight, which makes tool-less changes in seconds possible. It's characterized by the roll pin being far forward - my 4" & 6" stock 629s don't have that. Their front sights are pinned in (Roll pin further back.), making the change more difficult. I saw a real problem at the range yesterday - someone's pin punch was too small - wedged into the roll pin and broke.. oops. Anyway, that attribute was a selling point when I bought my 625JM and 627 Pro. I wish all of my S&Ws had that!

Oh, my 6" 629-6 is unreal in it's accuracy - they are all highly capable, it's just 'assured' that a Classic DX will be. Not for me... I like partial lugs!

Stainz