I have the Kindle 2. It is completely and utterly unsuitable for any sort of technical books - anything with diagrams or pictures. I’m not sure if the Kindle is any better, but I expect not. Also, you may find that you can’t get many of your textbooks for the Kindle. ANd finally, Kindle books are close to full price, whereas you can buy used textbooks.
So, for textbooks, the Kindle is worthless. Why is that? Is it because of the lack of having an actual book in front of you and being able to flip through pages, etc ( or throw it against a wall in some cases haha)?