I've heard a Levinson / Revel system that sounded great. Many dealers that sell Levinson, also sell Revel. Those two companies are owned by the same parent company. They better sound good together. That does not mean B&Ws are bad speakers.
I wonder if the parent of Levinson/Revel have tuned their product differently from most brands, so you'll hopefully buy the whole system from them to get the proper synergy and the best sound??? They would'nt be the first.
It really comes down to system synergy.
One reason B&Ws have become very popular is they sound great with a very wide variety of electronics compared to other brands. Many B&W dealers sell other British gear. Makes sense.