http://caraudiomag.com/articles/science-sound-vehicle-specific-sub-enclosure-review

Some quotes from the article:

"In today's age, with a huge slew of products being offered across the web, some at ridiculously low prices, it may seem to certain consumers that even this price point is a bit high. Having used some of these cheaper alternatives in the past, I can safely tell you that none have come close to matching the excellence of the Science of Sound offerings. If you're lucky enough to have a vehicle that accepts them, I would seriously consider this as a first option"

"I can't build you a better box even if you paid me more!" -Bing Xu, Car Audio staff writer