Well this looks beautiful!
I've been so upset after being suckered into 4.0. I will continue to try and get my site working there and then move over as soon as possible and more stuff becomes available. The community on here already looks great so looking forward it's launch!
If you are looking for some expanded verbiage, here's what I'd put:
XenForo permits the application of Permissions by Usergroup, as well as on a User-by-User basis. In competing forum software, permissions assigned per-User (i.e. Access Masks) have had a different approach and different selection of settings, limiting flexibility and leading to confusion on large forums. XenForo offers full parity between individual User and Usergroup permissions with a unified, streamlined assignment interface.