The round action SxS is a treat to handle, swing, and hunt with, particularly in a true triggerplate design. To me, the mass of the gun feels more centralized in the hand when carried than a sidelock or boxlock. No doubt the shape of the action, devoid of square edges, contributes to this feeling.
I am not familiar with the internal bits of the 486, and so I leave it to others to comment as to whether it is a true triggerplate design or something else. To my eye, it looks more like a rounded A&D than a true triggerplate, but I am no expert. I would save up for the classic Dickson/MacNaughton and forego the modern Beretta. I doubt there is much hand work in the manufacture of the Beretta. The Scottish gun was definitely hand-made, fitted, and regulated. While I applaud Beretta for creating and marketing a new SxS, a true Scottish classic should bring more enjoyment. My two cents!