Yup the idea of having the individual storage has appealed to me since SkyDrive first appeared; however I'm not so sure about going straight up to the web storage as it's often rather laggy when using the save feature in Office 2010 and that's only with fairly basic Word files. Dread to wonder how it would cope with Photoshop etc, hence the local sync quandary...
What I have noticed with Google Drive is you can add files to the drive and they are cached locally but then sync up to the cloud, So if I have a large file or many files they are copied very quickly into the local drive and you can move on to other work while in the background it gets synchronised.