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.
Always carry an extra magazine when CCW. Friends don't let friends get a double-feed first round out.