I don't know about the functionality, just that if you're sharing files with a supplier who is supposed to manufacture something from it, they're not supposed to accept the student version - it implies that you're past student and gone commercial.
Well I don't see a problem there. Our students have the same version, they get it for free, they can download it and register. They can use the things they make in our multiuser version.
One thing that I hate from Solidworks is that version compatability is only upwards. If you have made something in 2013 , it won't open with 2011. 2013 opens 2011 docs fine.
You can always export it as general cad format like stl or dwg. But you lose ability to edit parts.
The 20 you pay is only shipping and handling costs.
Before you start, Solidworks likes a healthy computer, not to old, enough memory, and at least Vista I think. Not your 10 year old that hardly does internet.