I saw the Meridian System demonstrated at Definitive Audio's 16th Annual Home Theatre Experience last month. It was quite impressive! I don't recall how large the screen was, but I believe that it was significantly bigger than 10'.
Definitive is apparently the biggest dealer for a number of high-end products and there are always new exotic products receiving their first or very early public exposures here.
A number of the audio systems there were ruffling the legs on my pants and I was wearing shorts!