To be honest I didn't think that Sketchup was anywhere near worth the money when I tried the demo, but then I had a need to produce a very large number of isometric drawings in a hurry at work. Having bought a copy for my company, it easily paid for itself in the time it saved producing the isometrics, I found so many "hidden" features I've now bought a personal copy.

If you do try the demo, be sure to enable and test the "sandbox". The ability to create an undulating terrain, drop a floorplan on to it and automatically create a flat base for your building, is extremely useful if you're integrating with software like Vue, as I am.