I half believe it was the presentation - dramatic, but also extremely clever choice of SACD source content with some theatre thrown in for good measure. However, that 12 minutes in a room in conference hall in London with the Nautilus speakers was something I will never forget for a "this is what money buys you" experience. Warm, huge dynamic range, concert hall experience - comfy chair and dim lights helped as well :)
At Tag, we built the "tag mclaren speakers f1" that had a lot of elements I feel borrowed from the B&W industrial design (but made F1 grade) - I used these daily for several years, but was never able to convince myself they were as good as that one time experience.