I don't own an A400, but have a 1301 Comp which I like for general shooting an upland game because its light and fast. I would say that it is hard to beat the features and quality of the A400 for the money, and if in the market for a designated hunting shotgun, that is the direction I would go. I find the gas systems on Beretta easy to clean and reliable, and the quality to be top notch.
Had my A400 xtreme out this morning blasting away at some teal.
Soft shooting and handles like a dream being a gas gun. No issues so far, cycles sporting clay loads all the wayup to 3.5” bb’s.