Took the Jet P to practice last night and had a solid 3hrs session with the band to see how the bass performed. In short excellent. The bass is still exactly as I received it barring the strap locks I have fitted. Powerful little beastie that really cuts through, the neck is great to move around on. The stock pickup and electrics work fine, I suspect it has ceramic magnets but clearly that's a guess on my part but it does have a pretty high output. The light weight also makes it a doddle for the longer sessions/gigs.
I may try out a Steve Harris pickup that I have knocking about with a good quality loom, but in all honesty the standard set up works really well as in there is no sign of the on/off volume and tone knobs you can get with budget components and the pots have a nice quality feeling when you make adjustments.
All in all, a cracking P bass.