I got 1 13w7 running in my bmw now. I love the sound of it. I'm a big fan of sealed boxes and how it plays EVERY song and EVERY note I throw at it with authority. I havent ever heard the fi so I can't compare the two but the JL is a nice nice sub. Obviously the price is an issue but there is a guy selling brand new ones on ebay for $400. I'm also not sure what the box requirements are for the FI, but the 13W7 only needs 1.875ft3 net. That's really nice seeing as my car is somewhat small. I'm not saying either is better but I am saying I love my W7.