I have been using this since march 2012. This is a big heavy sub All which Requires Equally big and heavy amplifier to drive it - I made a mistake due to budget limitations. The sub Itself is very well built and Will happily be driven hard all night. Sound quality wise, its pretty good - my system is low Passed filtered below 90Hz to the sub just looks so Effective the sub and sub bass.
Would I buy it again? Definately. Eventually I would like to have 4