I am not seeing anything on Samsungs site about trading in for previous Note7 owners. Only thing i am seeing is a max trade in for $300 for any phone listed.
Coming from a Note 7, i would say that the V20 doesnt have the same overall build quality or premium feeling that the Note did. But overall, i am pretty happy with the overall performance and the 2nd screen is more useful than i expected it to be.