Is the Samsung Galaxy Note 4 worth it?

I already own a tablet and a smartphone. Since both of them are getting old, I was thinking of swapping them for a Samsung Galaxy Note 4. From what I read online this device will allow me the wide screen and functionality of a tablet with the portability of a phone.
Is this true? Is a phone so big actually practical? Is a tablet so small usable? How does it compare in terms of functions with a smartphone and a tablet?
