I have been disappointed, updating from B&W 802, series III to B&W N804. It has taught me never to buy speakers that I do not hear first. It was my third set of B&Ws so I didn't think it would be a problem.
Room issues and associated components make such a difference to getting the best fit. How will you know if you are getting the speaker that brings all this synergy together. I replaced the N804 last year with ATC 20-2s. I demoed over 10 speakers, and was also able to hear the finalist in my home.
In comparison with other components, it was a time consumming and difficult experience. I did, however, learn a lot in the process of what I really wanted as well as know I that I didn't compromise. This method takes a lot more time & costs more money (no used deals). To me it was fair price to make sure I got he sound I wanted.