I've played a custom Jazz type bass made with a Moses neck.
When I saw it, my heart jumped a bit, because I've always been curious. I played it for about 3 minutes before I just put it down and moved on. My comments are:
Good workmanship, nice feel, appears stable, BUT, the sound was just thin and sterile. I've always been a fan of Jazz basses and I'd take a Fender or Lakland Skyline over this bass in a heartbeat.
I'd stick with Zon or Modulus. BTW, I liked the Quantum 5s I've played a lot more than this bass. But, I'm not a fan of graphite necks.
In fairness to Moses, there could have been a lot of things that caused the lackluster reaction: dead strings, lame pickups... Sorry, I can't give more details because this was almost a year ago.
Best advice I could give is try before you buy or get some kind of approval period.
Good luck.