This is only good for interacting with closed sessions - it's not useful for interacting with your current session. E.g. if you keep a large number of windows & tabs open & need help navigating between them, this won't help: Clicking on a tab or a window will open a NEW INSTANCE of that tab or window (which is absolutely not the default behavior I'd look for).

The feature to sync sessions looks like it could potentially be useful - it improves on the current open-tabs sync functionality by giving access to archived sessions. (Which I suppose is the one area where it's useful, but it's not remotely a common use-case for me.)