I had one come through, and it was very nice.
There was a smidge of noise which my customer asked me to address, and a little bit of shielding cured that. He'd previously had an MJ4 with the same issue, so it's nothing specific to the MJ5 per se. A little copper tape on the back of the pickups, a little more tape in the pickup cavities, short that stuff together and run it all to ground. Boom. No more noise.
There was a smidge of noise which my customer asked me to address, and a little bit of shielding cured that. He'd previously had an MJ4 with the same issue, so it's nothing specific to the MJ5 per se. A little copper tape on the back of the pickups, a little more tape in the pickup cavities, short that stuff together and run it all to ground. Boom. No more noise.