Beryllium Tweets

Don't intend to hijack this thread but do someone have experience with or knowledge of be tweeters from different manufacturers (Revel, Focal, Paradigm, Magico, Reference, Yamaha, Fritz, Tekton and more)? All the same or big differences in the construction and implementation. I'm looking for to add one to my collection of speakers and wants to be sure to get this "airy" and un-distorted sound at high spl:s. Hopefully this is of interest to the OP as well. Note - just a question about be tweeters.

Of the above I am familiar with the Revel and Focal Be models, and for my taste the Focal Kanta 2 gives me a more musical experience than the Revel F228 Be.  I judge these things with classical, folk, small ensemble jazz, singer-songwriter...no heavily amplified rock (which I love, just not to judge speaker musicality).

There's also a beryllium ribbon tweeter. First introduced in the early 1980's by Pioneer, designed by their TAD division. Frequency range up to 100.000Hz!

It was available in some top end speaker models like S-955 and S-933, but also as an add-on unit (PT-R7 and updated version PT-R9).

I don't think it is still being made, but they do appear on the used market from time to time. Not exactly cheap, but highly recommended!

Depends on the implementation and the tweeter - I have heard some dreadful beryllium tweeters that are so metallic sounding I want to take an ice pick to my ears.  These will remain unnamed.  

Other sound spectacular.  Tons of detail and wonderful imaging.  I like Magicos sound a lot and think they have one of the best Beryllium implementations. 

Incidentally, you could write the same post about AMTs today which are suddenly hot and could have written it in the past about diamond tweeters, silk domes, other metal domes, etc...

There is good and bad. I opted against beryllium partially because I did find the ones I tried a little metallic sounding but I also like to do something a little different and am super happy with the ceramic magnesiums I have in my speakers.