I love the JB and do not seem to have the issue with the low end the way so many others do - in any of the guitars I have used it in. Weird, but true.
However, for those that like the JB but want to take it a step further, the bridge model of the Dave Mustaine Livewires is fast becoming my favorite pickup. Good output, very good string definition and clarity. Much more full sounding than an EMG 81.
For me and my uses, it's just a wonderful pickup. Yeah, it's an active, but I'm amazed at the sounds I can dial in with it.
Worth a try for any JB lovers.