I own a 590A1, was lucky enough to hold A/B it with a 500 persuader in the shop before buying and the decision was easy. The 500 persuader had the same capacity and overall length, but that's where the similarities ended. the 590 has a substantially heavier barrel and tube, nicer fore-grip, aluminum safety and trigger guard. Mine came with ghost ring sights which are outstanding, makes slug shooting much easier. oh yeah, and a bayonet lug! Knife on the end of a shotgun? Sure, I'll take it. One "downside", the gun is heavy, but I don't mind the weight. After fondling the 590, the 500 feels like a cheap immitation.