Craig,

Good question. As most men here probably shoot skeet with an over under shotgun the speed of the single trigger is noteworthy. Furthermore, I have never had a failure or "double" of my Berreta shotgun.

However, the double rifle is another beast entirely. Think of it as two independent rifles on one stock. A single trigger, no matter how perfectly engineered, is still linked to the other. The most common mode of failure with a single trigger is doubling. With a double trigger you always have at least a single shot rifle.