I have been trying out Insync (paid version) for two days and I am not impressed yet. In most of my tests, I let the Windows 10 system to itself for hours to see if the synchronization will eventually take place automatically; my conclusion is that, if it does not take place within a few seconds, it will not take place until I manually perform a stop-and-resume. Note that synchronization at the root directory is more likely to happen (but is often only partially completed) than synchronization of changes in subdirectories.
Is that your experience as well? Is there something I can do to improve the synchronization behaviour?