There are definitely some interesting features in development. Things like placeholders (infinite) have been in OneDrive for a while (then removed because Microsoft) and then were reintroduced. I remember a few years ago a company I was working for used dropbox and I was shocked when installing DropBox instantly depleted my local storage - it felt totally bizarre that infinite functionality wasn't the default as that was what I was used to with OneDrive.

I'd like to see some evidence that sync is actually better in a significant way that is noticeable to the user - noticeable enough to warrant an incredible premium. For example, $10/month or $100/year gets me full office for my entire home and mobile, 1TB of storage, and Skype minutes (not that anyone cares about that perk). If its just for one person, that goes down to $7/month or $70/year. Why should I pay $10/month for just 1Tb of storage and slightly better sync?

EDIT: After reading some other comments, I see some evidence that your syncing is in fact better. It might be useful to highlight that specifically rather than making the blanket statement (e.g. faster, more robust rather than better). Now I might take a look at dropbox especially as my reliance on Office is decreasing.