I have one with the J/MM pickups. I love the MM pickup at the bridge, the sound I always try to emulate is Geddy Lee's Wal sound and the MM bridge pickup in series pretty much gets me there.
Love the skinny jazz neck, feels great.
Love the contoured body, which needs to be credited to Ned Steinberger and Stuart Spector. Best body shape ever created.
There's really nothing NOT to like about these basses, it's just a matter of whether they speak to you or not. The sound is more of a sweet, melodic midrange as opposed to the more mid scooped low end punch of a Spector (I just mention that because they are so similar in build...and I love Spector as well!).
Fuzzrocious Club #194
Brubaker Brute Squad #18
Spector Club #224 (USA NS-5MM, NS-2J)