I have one of these, and they are fine.
Details: This product allows you to enjoy free-to-view Digital TV on any television - with crisp sound, clear pictures and interactive entertainment and services.
Works with any TV * Twin SCART sockets (TV & VCR / DVD Recorder) * RF (coaxial) cable
30 free TV channels
Astratec TOPD2 Set Top Box Includes everything you need to start watching digital TV today. Up to 30 free digital TV channels and up to 20 free radio stations