Nit-pick: lots of people on this thread keep talking about "learning". I'm all for the students learning through this program, but that is not a goal of FIRST (really!). If you don't believe me, please cite a specific source from FIRST that says anything about FIRST's objective being to "teach". I'm pretty sure it's not there. As others have pointed out, FIRST's material only talks about inspiration.
Oh, and I'd like to repeat Karthik's call for anyone to name me a robot that is 100% mentor-built. I don't think they exist, but I could be wrong. I'm willing to bet, though, that a lot of people hold that misconception about my team (and BTW, if you do think that about 111, take some time and browse
our gallery - you'll see plenty of pictures of both students and mentors constructing/working on/repairing our robot).