1st v. 2nd edition of required textbook

I had a good question about the required text:  "Does it matter if we buy the 1st or 2nd edition of the required textbook?  The second edition is obviously much more expensive, and I was wondering if you knew of any significant differences in the newer edition?"

This was my response:  The differences in the content of the 1st and 2nd editions are relatively small, but not irrelevant.  I think the library has copies of both, so I suggest you take a look at them yourself before you decide.  Remember, you have free access to the e-book of the 2nd ed.