I have a MBP retina with 256gig hdd, if I understand it correctly icloud drive will be similar to drop box, and I will be storing the files on my hard drive anyway and they will sync to the cloud to use on other devices. That's great, except I'm limted to the storage available on my MBP it would seem, so is there a reason to buy that extra space in the cloud? My original excitement was I would finally have a place to put my movies for access anywhere through iTunes, but it seems that's not the way it is going to work. Am I getting this correct? Or does once something gets put in the drive folder does it now live in the cloud, or does it stay on the machine, or both?