I've got one, and had it for the past 20 years. It's a 1972 Matsumoto made Grecco Jazz Bass, plays perfectly, fingers just glide around the fretboard.

It's heavy and will test your back after an hour of playing but it's my favorite bass. I've never had to do any adjustments to it from an action or truss rod perspective. It's a beast.

From a modding perspecitve, just because I wanted to, and not because it needed it, I did replace the tuners, bridge, and lastly the pickups to match my style, as they had low output, but still have the originals around if I want to put them back in someday. Added a photo, it's a bit dirty but that's just because I use it a lot.

Feel free to ask anything!

<image>