I am on the side of they are a pain in the butt… well, were. I hear they are much easier to deal with now.
I bought four B&W 800 series (2 for audio) 25 years ago. Adjusted by ear and analytically using test tones and SPL. My system always sounded better with them but never did they sound perfectly integrated… I am sure my fault. But when I bought my current speakers I did so with the intent of not needing subs. I am very happy with the perfectly integrated sound.