Ok, I'll tell ya....
I picked up a used MP Jaguar in August from GC online. I am absolutely in love with mine!
It is made of Koto (Janka 940. harder than alder and mahogany, about the same as soft maple). Mine weighs 10lbs even. Some might say that's heavy, but it falls right in line with my other 34" scale instruments.
The body and neck are finished like a Geddy Lee, very thick, slick, and shiny.
The neck feels a whole lot like a Geddy Lee, but it's thicker front to back. I like the feel better than a Geddy. The inlays are not stickers. Mine has been very stable and I have it strung with D'Addario Super Light Chromes (.040 - .095). I hadn't used these before and I like them a whole lot too.
The stock bridge seems to be the one from the Squier CV 60s Jazz with the brass saddles. It's very good and doesn't need replacement.
The pickups are unmarked and have good output, of course the single-coil jazz pickup buzzes when solo'd. It has a nice tone stock. The bridge pickup has 70's spacing. Also, the P is in a slightly different location than the Squier Jags.
The pots and nut were the weak links. They used a plastic nut, and the really small pots.
Since owning it, I've made the following changes. I went to a stacked knob configuration and am really happy with that. I also put in a tusq nut and replaced the Jazz with a DP148 DiMarzio DP148 Ultra Jazz bridge pickup.
The Ultra Jazz blends very well with the stock P pickup. All in all, it's a great bass and a great deal.
I wouldn't hesitate to recommend it to anyone in a minute. If you have any doubts, go see for yourself.
Bob