My school district spends $800 / student, which my understanding is lower than the national average. Spending $678 / student for iPads, if it means not buying textbooks, notebooks, and other office supplies, doesn't seem like a bad choice... But I guess I'd have to see their actual numbers and see how much they'll actually be saving.
Its $678 for the IPAD, not the etextbooks.
Notebooks and office supplies will still be required for many things.
If the students can't bring the ipads home how can they be expected to study? Notes on paper are good but that requires paper and ignores the fact that a textbook is a more thorough study material than notes (for example it has practise questions). In younger grades penmanship is an issue so paper will still be required for certain tasks. Tests are obviously on paper, especially where there is a lot of writing. Longer typing exercises will be hell on a tablet.
Some classes such as math will be hard to adapt to an ipad, others such as geography will be significantly better with an ipad.
I don't doubt that ipads will improve the learning experience but the question is if the cost is worth it. Ipads can supplement the learning but cannot replace everything.
$678 is awfully expensive compared to competing tablets (nexus 7, surface RT at ~$200).
And does a student really need a retina display and a top of the line tablet for basic usage?