Has this been discussed as to its pros and cons (especially for zone
6B (maybe zone 7)?

This looks like a monster. I assume that it's pretty much
sulf-supporting, right? Would it eventually make a 20 foot wide hedge?
I have a spot in the yard that I wouldn't mind closing off with such a
beast. I've found a few pics which makes me believe that it would end
up being a very large mass.

Any takers?