I've been slowly reading through this thread and it's been a fascinating read, loving the different arguments put forward, personally I'm a fan of the B&W sound, my feelings largely echo Chaconne's post above, it's not a perfect speaker by any means, but I find with some instruments it has a eerily real live sound to them, particularly violins, cello, Clarinet, and saxophones are very life like, tonality is spot on with them.
I think just looking at the FR response of a speaker is a very poor indicator as to how it will sound, and more importantly sound in your room, in-room response is key, I have my 606's in a quite a dampened room, fully carpeted, large sofa and various plush furnishings, to my ears the 606's compliment that, I'm not sure they would work well in a modern sparse lounge with wood flooring and clean walls.
I'm not saying FR charts are completely useless, I just think it's more important to use your ears first, and then if you hear any issues see if what you're hearing corelates in anyway to the FR chart and maybe try do an in-room FR reading if your looking to correct or improve, but first and foremost try and choose the right speaker for your room by auditioning at home is possible.