Interesting how the audio hobby can be so subjective.

I don't find the B&W sound, or the tweeters specifically, bright at all, as mentioned.

For a personal frame of reference, I look at my Monitor Audio RS6 ... those were bright speakers with way too much attack with the wrong gear. Also, the Klipsch RF-62's. Man, THOSE are bright. In a lot of ways, the absolute worst speakers I have ever had to endure.