Save your money for something else. They have the famous B&W name, but they are not worthy of critical listening. The yellow Kevlar mid-woofer is infamous for noisy high frequency resonance, in the range of 4,000 Hz. B&W insists on crossing over these drivers to a tweeter at the very high frequencies of 3,500 to 4,000 Hz. It would not be noticeable if the crossover frequency was lower, such as 2,000 to 2,500 Hz.
Depending on the music and how loud you play it, you will hear an unpleasant high pitched noise. You won't always be aware of hearing ugly noise, but you will be aware of 'ear fatigue', where your ears get tired of being exposed to that noise. Many people mistake this ear fatigue as being caused by the tweeter. But it's really caused by the mid-woofer and B&W's choice of crossover frequency.
It's sounds worse in the less expensive B&W 600 series speakers. It's much less so in the most expensive 800 series where B&W spends more money in crossover components that filter out much, but not all, of this noise.
That dreaded ear fatigue is a major reason why so many used B&W speakers can be found for sale.