Sketchup is a very effective design tool as one works through a design. Its decent at multiple scales and allows you to move quickly through design iterations.
The program struggles with large files. Therefore, alot of information has to be broken off into separate files. The layers function is also tricky
before investing in a pro-version, practice using the free version. Its a good way to build your skill set
We use Sketchup for 3d visualizations for clients. Renderings 3d environments.