Notice that though most of these people are slightly reclined, their heads are balanced on their neck and shoulders. And notice they don't have to look down to see the keyboard in their lap, it's up close to the monitor. It's a lot like the posture used while driving a comfortable car, relaxed and supported. The PowerStationTM FS is very space efficient. One company was able to put 150 people into 6 x 7 cubicles where only 100 fit with their previous standard cube size, yet the workers felt comfortable and didn't mind the smaller cubes.
Shelves are great for personalizing the workstation.
Everything is within arm's reach. Even 6' x 7' cubicles are comfortable and efficient. It's like sitting at church, or at the dinner table, both things you don't do for many hours at a time. One reason, the old typerwriters didn't allow for arm support because the hands had to go up and down to type. This meant it was best to have your hands low, near your lap, to reduce stress on the upper arms, shoulders and back.