you can either love sketchup or hate it but what its not good for is making models for 3d prinitng. sketchup isnt a solid modeler. its a surface modeler. perts exported from sketchup usually have issues for 3d printing. many can be correctled with a quick run through netfabb but some cant. there are so many pieces of software out there its not funny and like what was mentioned before you need to know what type of modeling you are going to be doing. sculpting type stuff or mechanical stuff. blender and zbrush for instance are for organics and more of a sculpting type where freecad, rhino, solidworks, etc are more engineering or consumer products.