Tom wants to know if the CUJO Smart Firewall is a good idea. Leo says that he already has a firewall with his wireless router. That handles about 80% of all bad traffic. Also using OpenDNS can filter out even more. Then he could have a software firewall to handle the rest. Everything that CUJO does, he can do with other services that cost less or free. Mesh Routers also offer the exact same protections.
So rather than getting a separate device and paying $200 for it, he should get a router that has it all built-in.