I love Dropbox. The desktop app is easy to use; set it up correctly, let it sync, and you're good to go. When you need to retrieve your documents, photos, files, go to www.dropbox.com. Simple.
I do work at home, sync to Dropbox, go to work, go to Dropbox, download my file. Then work on it from there. Upload it back to Dropbox when I'm done.
I have used A Drive, Google, SkyDrive, you name it. I've tried them all. My favorite is Dropbox.