As I mentioned, literally just for sleeping in.
Do you plan to get changed in it? Without shoulder room, the only place you have enough room to get changed is in the middle, and with two others in there they will have to stay lying down and get right out of the way. However, getting right out of the way is hard if it’s raining because it’s all too easy to touch the sides then it’s soggy kit.
I stayed in a three man one once for a week with two other kids. There was so little room for our (modest) kit that it had to be piled up at the end and it was impossible to do that without it touching the sides through the inner. So we had soggy kit the entire time. Just not worth the hassle.
But even then, I still think the ridge design is the worst thing about them. So awkward and unnecessary now we have so many better alternatives. If I wanted a traditional canvas tent to go with my steel rigid fixie, plus fours, beard and real ale habit, I’d be looking for one of those ones with a short wall around the edge to push the ‘roof’ up.