I was a designer/builder of custom homes in Western Colorado for quite a while. Now I am doing design and working drawings, mostly residential.
I have been using SketchUp since its early days in Boulder, Co.
I think I am still at a journeyman level with the program, some facility with the basics and more to learn.
It has been a great communication tool in working with clients and I have improved greatly in using Layout to produce clean construction documents.