One bugbear I had with the first version I used (MC17) was that TV setup was 'terrible', in terms that it just pulled every channel down and you then had to go and create custom lists for only the channels you can actually receive.
Has this changed in 20? As in does it work similar to Windows Media Center in that it will do an OTA scan and only add-in channels you (or your tuner to be precise) can physically receive?