So, just a few thoughts on the Big J Blades so far...
I had a chance to play them with the band last night and everybody thought they sounded great. Also a few comments that they look cool, so that's good too I guess! Haha
I found them to be a lot more articulate than the Lace Man-O-Wars, but not lacking in low end at all. Played with a pick they were growly but not overly bright. A very nice, well balanced sound. Also very well balanced string-to-string. Definitely no complaints there. Highly recommended to anyone with a bass with a tighter fingerboard radius.
I also found the pickups very responsive to changes in technique. Growly when digging in, and softening/fattening up when played lighter. Also nicely sensitive to right hand plucking location.
When favoring the bridge pickup I didn't find the hum to be anything I'd ever worry about in a live situation.
Compared to the Lace pickups they replaced, and the Dimarzio Model Js that were in that bass before, I'd say the Big J Blades definitely lean more towards the "traditional" sound. I'm no expert on "vintage" Jazz pickup tones though, so some may argue that claim.
Overall I'm liking these pickups at first glance.