I seem to have acquired an old '80s yamaha BB1200, an active model, which has been PJ'ed. It's the first neck through bass I have ever owned, and so of course I got straight into comparing it with the bolt-ons I know and love. I can't see the difference. Sustain is good, but not markedly different from a well set up jazz bass. Tone is not noticeably deeper or more fundamental (acoustic tone is middier if anything!) than a Fender. Nothing that a bridge change wouldn't alter out of all recognition. The neck is very straight and very rigid. But is this a result of neck-throughness? Opinions? BTW, it's a lovely bass. I may change the pickups, because I am an inveterate fiddler, but not yet. I think.