You might as well have listened on your back patio as that
room has few side wall or ceiling reflections. I would expect
it will sound worse in any room.
They idea of a Take Home Fee makes sense. If you buy it applies to
the purchase.
The dealer has to size you up as a potential risk. Unless I was 95% sure
I wanted a speaker I would not ask.
Does the dealer have a normal sized room to listen in???
At this point you can't be 50% sure of anything. Based on the photo.