They seem to be well made. They have plastic/fiber cones which look pretty sturdy. I wouldn't say they are JL Audio quality, but they certainly match/exceed the stock woofers. They actually build these woofers for their patented bazooka tubes (pretty intense little tubes of bass) which go as high as ~125Wrms, so they can handle aloooot more than the stock woofers. My only concern is this monster magnet and how im going to modify the brackets without a dremel or any skill to speak of

- Kolme