Conservatory Roofs

Does anyone have ( or know someone who does) one of the new tiled roof replacements you can get for conservatories. We have been looking at them for a while now and have had far ranging prices from £5000 to £17,000.... We were sat in our's today but ended up having to go back into the lounge due to a massive hailstorm, we couldn't hear ourselves think and we got back onto the subject of replacing ours. They do seem quite a new idea and for that reason ( and the varying prices ) we are a little reluctant to take it further without knowing anyone who has had it done with success.