OMG, I just started reading ODE by Tenenbaum about 15 minutes ago and I can't believe how much better it is then my course textbook. Where my textbook obviously goes to great lengths to condense 3 or 4 concepts into one, brief, explanation and example; the authors of this book honestly take as much space as they need to.
5 minutes after opening to the chapter on linear, diff eq's of order greater then 1, it answered 5 questions that I was going to ask my professor about tonight. This book was written by a team that understands, not everyone that takes a differential equations class is planning on being a mathematician. They, not only, seem to realize that there might be 1 or 2 people out that there that didn't get straight A's in all their previous math classes, but there might be a few of us that missed an important topic here or there in our math classes. This is unlike my textbook, that seems to assume that you memorized every theorem, trick, and shortcut taught in 2 semesters of algebra and 2 semesters of calculus. All I can say is THANK YOU, THANK YOU, THANK YOU, to everyone that recommended this book as a supplement.
I can't say for sure that it's the best book for everyone, but for someone like me, that seems to always get the big concepts easily and then spends hours stuck on problems because of some small, missed, detail, it is perfect.