It wasn’t massively noisy, but there was some hum, despite the split coil. Any pickup will hum if it’s picking up interference, it’s just a matter of how much and how loud. At least that’s been my experience. TBH, I think it was/is a poor show by Fender to not have any shielding in the cavities of a £1k instrument. After all, the JMJ has modern (albeit reliced) Hipshot tuners, so it’s not an authentic ’60s repro, if that’s their excuse for not using conductive paint in the cavities.