Although this is fairly nice, I would recommend Syncthing over this. It has the benefit of not relying on any third party to store your data, it's all exclusively on your devices, along with some very solid security.
From my understanding, the primary purpose of this is for backup and syncing your Google Drive files between multiple devices, which is very similar in nature to Syncthing. Is there something else that I am missing?
I use Syncthing a bunch, but I don't really see any overlap between it and this tool.