It also gives you access to some 3rd channels while recording two. In fact all of them if the two recordings are from the same transponder like say BBC-HD and BBC1-HD. You could say record BBC1-HD and BBC-HD and watch CH4-HD, when one of the two recording finishes if it’s before the end of the CH4-HD programme you can record that as well by simply pressing record. Last time I played with this you can press record at any time, the recording will be made when the first BBC recording finishes