The guidance I received from Philip O'Hanlon, whom I trust is the following, to put this in context I have a room that is ~13.5 Feet wide by 23 feet deep with 9 foot ceiling.
For my room his recommendation was the G3, like you I was willing to spend extra for the G2.
He recommends at least a 400 sq. ft. room for the G2s.
Consider that he could have made a sale for the larger G2, but recommended the G3. I have no regrets with my purchase and trust Philip fully.
Barr
BTW I do have some open space in my room as well into a kitchen and the living room,