My room is 14' wide x 18' deep x 9' ceilings with a 106" screen, two tribute theater seats with a couch in front. Works great, seats 6 comfortably.
I would have bought a bigger screen, but I have a window with a black out shade on the projection wall and I wanted a fixed screen on the wall.
I ended up with about 18" of full length black velvet on both sides, 2 1/2' of velvet above and below the screen. Very satisfied with my theater room given it's
BTW, I paid ~$850 from Amazon for my W1070. Prime free shipping. I returned one projector (faulty) and the second one was a keeper!
I signed up too for prime to order all my stuff with free 2 day shipping.
Right now the 100 will be fine from 8-9 feet viewing. It covers my 4 theater chair configuration for now. When I do my dedicated room I want 120-130.