Well I like old Fenders of course, but really, as pointed out before, there are so many better basses around these days, better made and with a much better range of tones and playability. You can't buy the vibe though. I can't put my finger on what it is with an older instrument, after all, it's just some wood lumped together with screws, but there's some kind of history there that leeches out of them. Do you believe in ghosts? Well I can feel the vibes from all the music my Precision must have played over the years buzzing through it....it's very strange, but very inspiring. Maybe that's all bollocks, but I believe it.
I've played plenty of really really beautiful basses, expensive and built with outstanding craftsmanship, but many of them felt sterile and bland. My lumpy old Precision just begs me to pick it up and play it. Why? Dunno.