Very nice software. Stable, much better than Google Drive in many aspects (several accounts allowed, possibility to register several machines without trouble — I had constantly trouble with the two Macs I own everytime I synchronized them, on the fly translation to/from Office files, etc.).
And I should say that it is much more stable and reliable than GD. I used to have documents in GD stuck in the "Upload problems" state, which I could sync without hassle with Insync).