I was an early user of insync (Linux and google seive) and had issues with it when they added one drive support. I tried it out when I was getting all of my stuff off of google a while back. I pay for office and one drive so if I could consolidate it would be nice.
I'm not that old, but I had no problems whatsoever with InSync on either OneDrive or Google Drive (on Linux). Recently they have changed their licensing model to pay once for unlimited accounts and their development is accelerated.