Long ago, I bought a relatively early 60-15 (paid full retail) and really liked it - lovely fitting, great trigger, manageable with heavy .357 loads, light for carry on hikes up Bear Canyon behind the house. As has been extensively detailed around the web, I oafishly knocked it off a counter onto a hardwood floor and the lock self-engaged . . . partway. I had to go dig the keys out of the safe (which involved quite a shifting of stuff), lock it all the way, and then take the lock off before I could move it.
This troubled me, as this was exactly the sort of force a defensive gun might undergo during a violent encounter that necessitated the gun's use. "Oh, wait a minute, Mr. Cougar/mugger/etc. - I've got to unlock this darned gun that jammed up when you knocked me down."
Now, this was long ago (as I said, this was not too, too long after the -15s came out) and I was not yet comfortable inside the mechanisms of S&W revolvers. No YouTubes to help me feel comfortable learning. And there was as yet no "plug" product available, either. So, long story short, I sold the thing at a loss and eventually bought a 3" SP that suits me fine.
But I would have liked to have kept the 60-15. And, given today's world (what with me now having learned what to do under the hood of a S&W revolver and with The Plug being on the market), there's no doubt I would have kept the gun had this happened today.
I'm not necessarily trying to say that you should disable the lock were you to get the gun for yourself (though it's what I would do personally, and I'd install The Plug) - because only you know what's right for your circumstances. I just mention this because this unfortunate long-ago event is the only reason I don't still presently have that dandy Model 60-15. It was a great gun, and I wish I still had the thing (with the mods that would make me comfortable carrying it installed). If you decide to buy that one for yourself, Jim, I'd be really surprised if it didn't suit you.