I agree with this. I still think it is the best for documents, photos, and files since you can use it on any platform....plus it will sync your videos unlike icloud.
If you use iTunes to copy the file to your iPad, you still have to use the "Import from iTunes" function in Numbers to actually see the file (don't know about Pages but it's probably the same steps).
Personally, I wouldn't use a cloud service with any data I considered important or confidential, but that's just me.