I was in the same boat as you, I was torn between the SBE 2 and the Vinci...
I've never shot 3.5" and I don't even think it's necessary, besides, it's not that big of a difference, I'm here duck hunting in Spain shooting 3" shells, and these Spaniards are knockin these ducks deader than a door nail with 2 3/4th inch shells...
My cousin went with the SBE 2, me the Vinci... we both went to the range and both said the Vinci was the better gun...
Everyone is gonna say that it's the new model bla bla bla and therefore it's not tried and tested... I say it's a benelli, they stand behind their workmanship, and yes, I know some people on the inside in the Benelli company and they think that the future of all shotgun will probably be the break down in 3 piece configuration.
anyways, I love mine man, can't tell you how much I love it, I even love how it looks, the SBE 2 is so ordinary looking, when I pull the Vinci out, it looks so different... I know some people dont' like how it looks, but it was designed to kill, not to win fashion shows...
I love it, good luck!
Jack