Dave:

I have had inertia triggers on a Beretta O/U and a Browning Superposed. The Beretta triggers have worked flawlessly even with 3/4 oz. 20 bore loads. The Superposed gave me continual problems and it is currently being shipped back from Midwest Gun Works where I had it converted to mechanical. In fairness, I think that my Browning was more about an individual gun than about a flawed trigger design. Given my choice I would prefer a mechanical trigger on a single trigger gun.