My Take
Dropbox (or a similar app) is a must-have for iPad deployment because it allows students and teachers to save their work easily from many apps, and access files that were saved at a computer. The only downside is that free space is limited and videos will consume that quickly. You can get more space with referrals or by purchasing it.
How I Use It
I use it to access files from any computer or iPad/iPhone device simply by logging into my account. It is a very convenient way to store files in the cloud.