Don't know if this video has been linked before or not. It is about 6
minutes and is very good.
http://youtube.com/watch?v=mtIHjm-SUCs
To me the comments I have read about the lights being confusing are
warranted. A simpler "system active' light would be better.
I wonder how accurate the height adjustment can be since it has the
ability to disengage when the system 'fires'.