If you only used the basic Push/Pull tools and never opened LayOut or Export, save your money. Stick with (or the iPad version).
Many users ask, "Why bother with a 14-day trial if there is a free web version?" The answer lies in functionality. SketchUp Free (the browser-based version) is excellent for tinkerers and students learning the basics. But if you are running a business or working on a complex project, the limitations of Free become frustrating quickly. Sketchup Pro Trial Version