We built a little while ago with M and have had a continuing problem the shadow clad on the upper level of our house. It seems to continually buckle outwards at the top and bottom. Currently it is so bad it is letting water in and has stained and drips from the garage ceiling. The builder has had two goes at it and they say they will deal with it again (in their own time of course). It is on walls which face North and West so it does cop a beating but still its an exterior building material.
Just wondering if anyone else has had a problem, and wanting to warn people who are thinking of using it.