Does anyone have any comments, either pro or con, on the use of composition
decking material? Right now, we have the usual pressure-treated lumber,
which requires a lot of maintenance. Also, we live surrounded by large
trees, which help to blacken the surface; this is hard to remove and
conventional cleaning/sealing products don't seem to give a satisfactory
long-lasting result.

I know nobody who has the composition type so would appreciate any comments.