The walker is very interesting – but I can’t tell if it has its own stability control, or if it’s just being controlled by a very skilled driver. It looks kind of tippy in any case, and I’m not sure I would want to try it out on the stairs! I got the feeling from the sound, that the actuators might be linear motors, or leadscrews, as opposed to pneumatics, but I can’t tell for sure from the resolution of the video.