See other failures under 000.html.
Look Ergopost 2Ti carbon fiber "layback" seatpost. Failed at "bend" for layback. From http://cozybeehive.blogspot.com/2010/01/look-ergopost-seatpost-failure.html as of 2010/03.
Rider weight approx. 75-80kgf. Failed after about 2 years use.
Look Ergopost 4 carbon fiber "layback" seatpost. Replacement for above. Failed at "bend" for layback after less then 10 minutes riding.
The Ergopost 4 is reportedly listed as both a road and MTB post.
See also FAIL-131.html