I think this is a great idea for me- I work technical support and often have to get large files from customers/ partners who do not have the ability to send them in a secure manner. Also I work on about 4 different computers during the day and it is helpful that it stores into Dropbox by default so that I automatically get the file on each computer that I have that account on. If worried about the secureness of your Dropbox, you can create a free new account that only stores your airdropper folder and share that folder with your primary account. That way no email addy or Dropbox is exposed, only the info. As stated already, if you encrypt the info, there should be little exposure. It is not necessary for everyone, but for someone like me who has to get files securely very often from folks with restricted firewalls, it seems a great solution. The file size would be the only limitation that might require me to find another method- sometimes even 50 MB isn't big enough which is I assume what you've said you have tested up to.
