When I recently purchased my HD shotgun, I went into the store looking for a 500. They had one. The guy behind the counter told me that he also had a 590A1. I asked to see it. The second I held it, I knew it was what I wanted. In my opinion, it was worth the extra $200. It just felt more solid. The forarm didn't wiggle around like it did on the 500 and I liked the extra weight up front knowing it would help dampen some of the recoil. Also, I don't know if you know this or not but the finish on the A1 will last a lot longer than the 500. It is parkerized and also has some other sort of coating on it which makes it hold help well. The A1 also comes with the Ghost Ring sites if that's what you like.