OneDrive is a bit rougher on a couple of edge cases, but it works well enough. Well enough, at any rate, that I'm not prepared to quadruple my spend for the difference.
(On edit) The point being, not that I think that Dropbox will stand or fall on my opinion of their services, but for Joe and Jane average "I can get OneDrive and Word and Excel and Powerpoint on my Windows laptop and my Xperia phone and my iPad for the whole family same price as Dropbox on its own is a pretty compelling choice. The missing features like Linux support aren't really going to factor in for most people.
With Office 365, it's a steal.
Oh and there's the nonsense "magic" it does with OneNote notebooks. In fact, I'm pretty sure I accidentally deleted a OneNote notebook earlier today when scrolling through my OD account with the Mac client.
It shows file extensions for me.
Wow, this is a new development in the last 4-6 weeks. A very welcome one and I'm happy to have been wrong. Thanks for the heads up.
One of the best features you get with OneDrive is full Office integration. You can either access your documents using Office Online, which are full-blown browser versions of Office apps, or you can open your files in Office on your computer. Changes you make to the document are live synced and versioned, so it's great for collaboration.
I'm curious: what did you think of Google Drive vs. Dropbox? I precisely felt that Dropbox was doomed when I switched to Google Drive last year because I couldn't see any competitive advantage to it anymore.