I recently bought SketchUp Pro, and today I will talk a bit about it
The version I have of SketchUp is a student version of it and that means that I can't use what I make on there for commercial use, basically meaning that I can't make a business using SketchUp in any part of it. Now that I have SketchUp Pro I can use it for a business and I get a bunch of other features like Layout, which lets you lay your 3D Model out into a printable form.
The reason I got this was for two reasons, number one is that I could use Layout and then having access to Layout I can really go through the book "SketchUp & Layout for Architecture". The second reason is that I can someday make a business, which I hope will be soon.
SketchUp Pro costs $695.00 USD
SketchUp Student Costs $49.00 USD
If you are new to SketchUp and not sure if you want to really get into SketchUp and you are still a student I would deffinitly suggest you get the student version even if you have enough money for the Pro version.