About two years ago, on a lark, I made a very low bid on a 586-1. To my surprise I won the gun. I was surprised how heaver it felt than any of my M-19's. It feels like an N frame, to me. I liked the trigger pull both single action and double action, but somehow it did not feel like a M-19 either in my hand or in a holster.
So all in all I was not overly impressed with it, UNTIL I SHOT it. As much as I hate to say this I prefer shooting it, with magnum ammo, to any of my M-19's. Even worse it has replaced one of my M-19's as one of my ready guns!! I can't think of any higher praise.