The Kinect has a very limited range, is not accurate and works only in certain lightning condition. That's why they added a laser scanner. Those are over $1000. Then in order to build the map via SLAM in real time you need a really powerfull PC/Laptop. Even a netbook is not going to do it, at least for the SLAM in ROS(ros.org). Then it looks like they added a all angles are 90° assumtion, because normally the map does not look that nice because little errors accumulate. So it will take a while till we see something like that outside universities.