The SonicWall TZ670 – Appliance Only 02-SSC-2837 firewall is one of the best mid-range firewalls that offers superior performance with a simple management interface. The SonicWall TZ670 – Appliance Only is rated for 51-100 users, 5.0 Gbps firewall throughput, and 2.1 Gbps VPN throughput. Trust that your network security environment is protected with any of the SonicWall licenses that include Total Secure Essentials, Total Secure Advanced Secure Upgrade Plus Essentials, or Secure Upgrade Plus Advanced enhanced security features.