Dan and Dmo, yes, I have also used a separate screen room in my past lives. And they've worked OK, when the wind hasn't blown them down. Dometic's screen room/awning, since it is attached to the side wall of the trailer, makes it like having another separate room to go into, and we've found a lot of ways to use that advantage. We do most cooking inside the trailer, then just pass the food through the door on a tray into the screen room where we eat. When we had the 122, we put the loo in the room and, when nature called at night, just went out the door into the "bathroom." Anything we forget to bring into the screen room is just two steps up in the camper. Arms full of stuff? No unzip and rezip to get in and out.
I'll admit Dometic's unit can be a PIA to put up, but we've gotten quicker with it each time we've done it, and I carry a short stepladder in the pick-up to reach the high part. Different strokes for different folks! Happy camping!