John,
As your aware, Beretta & Benelli are the same company.....Both fine firearms & quality built....It's the subtle differences that make the differences.....The front safety is totally awkward. Because they're gas operated. They're front end heavy (shorter barrel helps). The 1st Extrema's had super long stocks too.....Not good for a gun that would be used for upland in a universal gun. I'll admit the A-400 seems to be redesigned to fit better.
This is all about me......Everyone fits and shoots a shotgun different.....If a person likes it. Go for it.....I do suggest you shoot one 1st before you shell out the kind of money they cost......I have had a lot of friends try my Benelli's and they have all bought them.....Heck, it's the same reason I left my 870's and Mossberg Ulti-Mag (1st 3 1/2" gun).
ps......I hunt and shoot a lot and have never broken a part on my Benelli's with the exception of the original SBE's. They a problem with the ejector in the barrel......About a 5 minute fix......And that ejector has been redesigned.
pss.......I have a flip phone by the way......lol