Fender AM Vint. Tremolo Jaguar/Jazzm.

Bought it to upgrade my Squier J Mascis Jazzmaster, and it did not disappoint. Only had to screw it in, setup the guitar to my liking, and then it's as much wobbly goodness as I desire! A fantastic option for whoever's looking for a proper Fender Offset trem with that very useful little button (which is recommended to deal with string breakage, maintaining the same tension, but I use it to guarantee that my Kevin Shields-style dives won't go up in pitch).

As far as I have used it, there are no cons, other than I had to get a trem arm along with it, as my original Squier one did not fit. Not a big deal, but still made me wait a bit until I could try it for real.

Oh, it also shines like a freaking diamond. Puuurty stuff.

I put it on a SQ Jaguar. Comparing to the stock tremolo, this one is machined better. Edges inside the tremolo are smoother comparing to the original SQ tremolo.

The other obvious advantage is the locking button. It helps a lot during a tuning or string change. The nut that holds the tremolo arm loosened up a little over time (couple months). So, I am not sure how reliable that part is.

It is easier to get and cheaper comparing to other alternatives. If the setup is right it works perfectly and holds the tuning very well - considering the nut is well polished/lubricated and the tuning machines are good enough.

Got this for my J Mascis Jazzmaster. It was a direct replacement and fited perfectly. The setup is pretty straight foard, you just use the lock to block the bridge from going sharp, tune the guitar and use the tension screw to balance the tension. This will help you to keep the tuning of the guitar if a string breaks. You need to pair it with the Fender AM Vintage Trem Bar Jazzmaster to use it tho.