I went from the Rift CV1 to the Rift S and I think the upgrade was worthwhile.
You get better resolution but also better FPS since the S is only 80Hz, so 10 FPS less needed and if I use pixel density of 1 with the S, the picture is a lot better than the CV1 on 1,5 (or above).
You can also ditch the external sensors and get better handcontrollers.
But, as always, there are even better headsets out there.
So if the cost vs. benefit is good enough for you, only you can know...