Oh, boy. double edged question. If I say that its worth it i'm gonna get bashed for suggesting that it is. Most people on here will say there are a ton of subs that are a lot better for the money. 520 is a decent price for the xxx cause that is just what they sell for online and
ebay. you can't get them much cheaper. If you have the money and want to spend it like I did. I would say if you are looking for sq sub that can also get loud. Go with it. Like I said I've never heard an aq so I can't compare. Also, I had it ported and tuned to 30.