The following phrase made me feel a little uncomfortable about using the product.
"How can this be a free service? Magic. In the future a paid service will be introduced offering more awesome features, but don't worry it shouldn't affect the free service."
I'd rephrase this - definitely remove the shouldn't as that tells me that while my files shouldn't be deleted, they might be.
Finally, just a minor thing, but the down arrow under the "Click Here Or Drag & Drop To Start Uploading" doesn't work for me (latest Chrome on Mac). I assume it should scroll down the page but it didn't for me at least.