Not sure if you would have tested this yourself, I honestly doubt if much people have. But, how far away do you think you can be from your Macbook and still unlock it with your Apple Watch? The remote unlock feature is really useful and work well but will you want to be able to unlock the Mac from distance away? Cnet have put it to the test, check out the video:
Home Apple watch How Far Away Can you Unlock your Macbook With your Apple Watch?