Beryllium Tweeters - Your Opinions & Comments ??

I notice the Beryllium tweeters cost about $500 each!  Focusing mostly on SB Acoustics (Satori) but you are welcome to comment if you have heard any brand.

Can you hear the difference?  Are they an obvious Upgrade, or do some people find them to be TOO detailed or TOO bright?

I am mostly used to the Dynaudio D28af textile soft domes (back in the 90's when af didn't mean AF, hahahaha!)

I kind of want the best sound i can get at any price but not if it produces listening fatigue and such like that.  Thank you for reading...