I have enjoyed one of the first pair of Focal Sopra No2 speakers that arrived stateside, driven by a smooth-sounding McIntosh power amp, the BE tweeters don't sound too bright at all. I can and do listen to that pairing for hours at a time.
Having said that, I've auditioned the same model speakers driven by a "more contemporary"..."fast" amp and didn't find the sound as pleasing. When I audition speakers I typically spend some "quality time" with the audition and felt that I probably couldn't listen to this "fast amp/Focal" pairing for as long as I can with the setup I have at home.