The Ruger system is the best of them all. On the autos, it just locks the safety down & keeps it engaged. If you don't have the safety on, it can't lock it down.
On the New Vaqueros & the 50th Anniversary Blackhawk, it just acts as the anchor for the mainspring & keeps it from compressing when the lock is activated. With its location (in the gripframe underneath the grips), it can't be engaged unless you take off the grips or drill a hole in them. Also, I think at least two aftermarket manufacturers have made "replacement mainspring anchors" that do not have the lock.
However, I STILL DON'T LIKE INTERNAL LOCKS. And I hope Ruger keeps them off the rest of their guns.
Another reason to buy USED guns...