I love my 590A1. If subjected to severe use, I'll take it over a 500 in a heartbeat. Under NORMAL use... It's great, but I would definitely grab a 500 to target shoot/hunt/bust clays with. It's more versatile since you can change barrel length and chokes, and it's not unreliable by any means.
Those who hammer their swords into plow shares will plow for those who didn't...