Ah - lower stature of JL subs to fit the box. The way that is worded makes it sound like you think the JL is a lower level sub than the BSW, which isn't fair to the JL.
The w1 is a really good sub, they also make the w0 and WX lines which slot below it. Yea it is on the cheap side but they don't need a ton of power and sound great.
Personally I think I'm going to have a custom box built for a Kicker 10" L7, with a cutout in the door for better pass-through. If I can get away with it I may even try for a 12" - There is just no replacement for displacement
The only problem I have with the BSW system is the 8" sub vs a 10" - I simply don't think it can move enough air to be really effective, at least for my listening style.