If you heard them mentioned here it was probably me. They can be hard to get because he runs a small shop and does a lot of oem work for major builders. He'll make time to do customs, though, too. I have about 10 custom Bartolinis he made for me.
There's no finer pickup when it comes to build quality and research and development. Bill was a nuclear sound engineer back in the day. He is one of the smartest people I've met in this business, and he and his wife among the nicest. But that doesn't mean you'll like all their pickups. There are tons of models, many created for a specific person or need, then marketed later. So you might hear one and think you don't like Bartolinis but you really just don't like "that one". His descriptions are accurate and if you go with them, you won't be disappointed.
They do leave open the opportunity to go active, and my favorite setups are ones where I can switch from active to passive on the same guitar. He has some strictly active pickups, but they are essentially the passive counterparts with preamps built in rather than seperate. So if you don't have a lot of room in the control cavity, get those because you can still bypass the preamp if you want.
But don't avoid Bartolini because you don't want a fancy active complicated guitar, though. Their passive drop in replacements should still make you happier than S.D. or Dimarzio.
Best I can tell, Lindy is also one of the best pickup makers, but doesn't venture into new technologies. For a vintage tone he could be your choice, but I'd go with a Bartolini setup. Everyone who's tried them marvels at the string separation, too. The individual notes are cleanly defined, instead of mushed together.