I have an imac with win 8 dual boot, and I just took the 365 subscription. I don't like the idea of subscription software, but now they have bundled in 1TB of OneDrive per user of the subscription (5tb in total), my storage needs have been solved.
The uploads are a little slow, (download/stream is fine) but now I have all my video and music on OneDrive, and with a good connection, it all streams. The file limit is 2GB (I would prefer 5).
The way I'm looking at it, the subscription cost has vanished as I'm no longer paying for other subscriptions storages or fast external drives (I still retain one old HHD for annual backup stored out of my house.
The online office editing from OneDrive looks good too, but I haven't really put it to the test yet.
All in all, the MS solution suits my OS/Win balance/needs perfectly, its just my google tablet that is left out in the cold.