Ignore the last 2 reviews as these people don't know what they're talking about. Control D is a DNS resolver, that blocks malware and ads (really well). Yes you can do "geo-unblocking" with it but that is a niche feature they dont even advertise. I personally use it for BBC iplayer, it works fine, but even if it didn't I'd still use Control D for managing my networks and child devices.
A+ for me (as a person who actually understands what this service does).