Best semi auto on the market if it fits you. Cycles absolutely everything. Very nice balance. Beautiful recoil reduction system, shooting 3.5" heavy magnum loads is a breeze. Easy to disassemble and assemble. Some people say a shotgun needs cleaning only after 500-600 shots due to its self-cleaning design. Flawless performance in any weather, corrosion protection. I tried SB II and Vinci, and the Beretta A400 is my favourite shotgun for waterfowl hunting.
There is a newer version, that called Xtreme Plus. I don't think that an oversized bolt handle and a central bead worth the higher price tag. It could be a better purchase if you are a left-handed shooter as this model has a reversible safety.