"Already formidable predecessors". I couldn't agree less. I owned the whole serie with the 702 S2's as front speakers, the HTM71 S2 as center and the 707 S2's as back.
B&W speakers sure do look great and they probably have the best marketing of all brands. But man I'm happy that I sold my set and switched to Revel. The best choice I ever made in audio!
B&W speakers are showroom speakers, they look great, when you listen to them for a short demo they will reveal a lot of detail in music, you will hear details in the music that you don't hear with most other speakers. The looks and the attention to those details draw you to buy them.
But once you got them home, you will find out that they are everything but accurate and that you want to turn down the volume after a couple of minutes because of the sibilance. The highs are way to pronounced, they sound almost hollow, I just couldn't get them sound correct. Yes with some specific songs they sound well but not with everything, not even 30% of my collection. Overall I recommend you guys to look for neutral speakers, then everything just sounds as it's meant to be and don't fall in the same trap that I did.