I have never owned one of the early 357's, but from what I understand, the changes from the early guns to the present model were mostly cosmetic. I know you can run full house 357's in the current models all day and twice on Sunday and never have a hiccup. They are very durable guns. Of course any mechanism will wear out eventually, but I don't think I could ever wear out my Dan Wesson 357. Maybe my children or grandchildren will, but only if they shoot it a lot more than me or abuse it.
Roll Tide