I recently received a new cable box from Comcast after my old one died and to my dismay I discovered that the new cable box was sending a 'no record' signal to the downstream channels added, so i can't burn programs with the dvd burner. I like the time difference and didn't like this new "feature". This little device is the perfect solution. The video connection went from my cable box through Grex-7.4 and then to my DVD burner. the problem is that the "don't record" signal has been removed. I can't tell if the picture quality has degraded a bit as I have a picture from two different sources (with and without being run through a DVD recorder) but if there is any degradation it's not enough to worry about . I am very happy with this purchase!