Yes, I use an 8 ft x 13 ft x 22 ft (Cardas room shape - golden cuboid) with their recommended speaker/listening positions. The imaging/focus really locks in from "the" chair, but nearfield listening isn't for everyone or every speaker.
My single (large) driver speakers "beam" the top 2 octaves, which with nearfield setup helps to factor out the room. The speakers are mass loaded transmission line designs, so bass roll off matches room gain quite nicely to below 30 Hz. Of course with single driver designs nearfield coherency is assured.
The room was not expensive to build given that the space was already available. Storage spaces on two side, the other walls are exterior (basement). No windows, everything is insulated including the supply air duct and the fiberglass exterior door with weather seal. Dedicated audio circuits (a no cost feature when building a new house) and cryo'd hospitcal grade 20 amp receptacles (my only real splurge for $99) tops it off.
Without this sort of setup, I'd seriously be looking into a good headphone based system with smaller/simplier speakers for "background" listening.
