I had an old one in a 7 tip....
I believe, here we go again (just like everything saxophone) the older versions are said to be better.
The tip openings are numbered just the same way an otto link is but I can't say if the sizes are the same.
If you find an old one the box will be orange and white with made in West Germany written on it if its still around.
I think the baffle shape differed along with the composition of rubber from old to new versions and in fact the new ones could be plastic. That kind of rings a bell.
Some people have experienced leaks with the adjustable baffle.
I didn't find it too comfortable but you can get used to it.
After a while I just became turned off by the adjustability as a gimmick rather than useful feature and although it never sounded bad I couldn't find a setting on it that knocked me out either.
I think Richard Elliott was renowned for playing one.
On the plus side....
If you are desperate to have one, I don't think they have reached silly money status just yet........
But I'm sure its only a matter of time before some one sells the MONSTER, GUARDALA KILLING, LINK SLAYING HOLY GRAIL that was played by some one who's aunty knew John Coltrane
