That's a gorgeous piece of kit for an in-wall subwoofer, and the vent option makes sure nobody notices it, but everyone knows it's there, exactly as a subwoofer should be. The price is darn good too, at two grand for the full kit (sub/amp), not to mention retrofit friendly (no worries about heat from built-in amplifiers, woo!).
This is definitely at the top of the list for a future theater build out. I love my speakers, but I've always wished I could make the subwoofer disappear.
Now I can.