Any success with newer Yamaha, or other?
I'll leave the historical questions about Musser's and Deagan's bars to others, but FWIW, I got a quick tour of the Musser factory back in 2000 courtesy of John Piper (hell of a guy, but that's a story for another time). I got to try a couple of sets of vibes, and in both cases, the bars were
outstanding. Whether they dug out a special couple of sets for John (one was a "Piper" vibe, the other a new "One Nighter") or not, I'll never know - but I'd put those bars up against any Musser bars I've played (including a few 1960s instruments.) Some of the bars produced in the 1980s were (IMO) sub-par, but they really seemed to have turned things around at the factory. "One man's opinion..."
I've also played a few newer Yamaha instruments - great bars as well. I got to try some of the new Premier vibes a few years ago, and those bars really put me in mind of old Deagan bars, in terms of the shape, sound, and feel.
However, if you really want to check out some great bars, look into the vibes being made by Nico vanderPlas (
http://www.vanderplas-perc.nl), or those made by
Doug DeMorrow.