It depends on how serious you are about your privacy. I owned a house in OH where the DNR had, for a time, recommended multiflora rose as hit had pretty flowers and lots of thorns. The previous owner had planted them all along the back property line. However, after a bunch of people did this, the same DNR came out and declared it to be an invasive species. It has issues.
Ours was taking over. It was growing up to the trees and battling out with the grapevines for supremacy (and winning). I tried spraying it with Roundup and it bloomed. I found the only way to get rid of it was to cut the branches away to allow access to the base, cut it off at ground level and spray the stub with Roundup. My neighbor and I were both battling this floral demon and had a challenge going on. I cut out one particular plant and, after pulling it out of the trees, I stretched it out and it was 35 feet from base to tip of the longest branch. I lost. He had one that was 50 feet long.
But I will say if you have the space and want to keep basically everything on 2 or 4 legs out, this is your ticket.