I just got a T-Box installed.   I had freeview dvb-t before but wanted the recording capabilities.

1, 2, and 3 look great, but the bitrate of Four is atrocious, it looks like a bad Youtube video, any motion results in horrible blocking artefacts. 

It is really really bad, seems worse than sky even. 

I am also noticing on text elements, that the de-interlacing seems bad, banners seem to jiggle up and down.  It isn't the tv as the T-Box is outputting 720p,  my old STB output 1080i and didn't seem to have the jiggling issues.   This does not affect the OSD, so must be related to the de-interlacing of the video.