It's worth noting that in some cases the first or last services of the day are outside the time bands which the Superfare offers.My suspicion is that travellers who book the evening slot will usually end up travelling on the last or perhaps penultimate train of the day. Similarly those booking the morning slot on weekends I suspect will end up on the earliest train of the day. Some travellers will be ok with a very early start or late finish to their journey, but for those who are not, I doubt this scheme would be much use to them.