The 800 Diamond's bass is deep and powerful, but you still have to be careful with cables and components to avoid brightness; the response is a bit lumpy, and I'm not in love with the FST Kevlar midrange, but I have owned several B&W speakers and I'm familiar with all of them. While the 800 Diamond is the only one I still consider a good value in the line, audio has moved forward and several new speakers designs are better at the same or lower price, for example Acoustic Zen Crescendo, Legacy Audio Aeris, Magico S5, PBN Sammy, PMC IB2 SE.
