My main use case for SonicWall NSv is configuring SSL VPN accounts and setting up remote access for VPNs.
As a specific example of how I use SonicWall NSv for VPNs or remote access, I download NetExtender for the client, then go into SonicWall and set up a user account using the WAN address for the login. I set up a username and password, and document the domain, configuring that on their NetExtender on the client side and logging them into SonicWall so they have access to the company shared drives.