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You are right in that we use COFDM on the DVB-T transmission standard. Overall I guess it works fairly well but it is not as effective as analog in difficult reception conditions.
A few years ago I lived in an area close to the transmitters that had problems with multiple path reception (ghosting). With analog it was difficult to get the antenna in just the right alignment to have a perfect picture but it was always watchable. The same set up with digital worked well most of the time but was prone to annoying bouts of pixellation as signal integrity was lost. This was especially bad when a bus stopped alongside the flat! At the time I was using an indoor antenna with a digital signal strength of 85 to 90%.
I now live in the country in a medium to fringe reception area. Digital reception is generally good as there is little interference and signal strength is sufficient for reliable signal reception.
Overall my experience has been that it is all or nothing with digital - if the signal is strong enough for the decoder to give a picture it will, otherwise no picture all. In difficult conditions though it will frequently pixellate in a small segment of the picture or worse even in what would seem like a good signal strength area.
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