Pros and cons
Ease of Use
I bought a couple of these as an upgrade from two Kenwood shallow mount subs that I originally had in my truck. They are great subs, and I can tell a bit of a difference in low-end output sound quality in my system. I am running these two subs on a Fosgate Prime 1200 amp putting out about 650 watts to each sub, and they have no problem handling the power. They were mounted in a custom box built by a local audio dealership. Luckily, I know the shop manager, so he was able to get me a pretty good deal on them. If not for that, I'm not sure I would have replaced the Kenwoods. These do hit harder than the Kenwoods do, and the lows are a bit deeper. If you have the money, you won't be disappointed. However if cost is a factor in your decision, there are lower priced alternatives out there (Kenwood and Alpine come to mind).
Pros: Sound quality Build quality Low-end response
Cons: Cost!! I thought I was going to pass out when I heard the total for the bill. Coolness factor is almost non-existent since mine are mounted in a down-firing box under the back seat of my truck.