I love Fi as much as the next guy, and have installed several Q's myself in boxes I hand built, but JL subs have to be some of the cleanest I've ever heard. The Q's pounded and were louder, but JL does make some solid subs, however overpriced they may be. In the right box, a 13w7 sounds cleaner than anything I've heard. Although I'm yet to hear an SMD, which from what I've read has got JL beat hands-down.
Well i heard the W7 and it sounded the same as a Kicker CVR i heard