I've heard the B&W 800 and 801 Diamonds with dealer-matched expensive electronics plenty, and whether we call it 'fatigue' or not, I do not like those diamond tweeters, great hardware or not. My ears tell me to turn it down or off, not good.
I still think different speakers' tweeters sound different, that's all, some better to me, some not.
Try the BRXs and give us a good report! grin.