We recently received video of some composite decks in Florida. The decking problems here are numerous. Twisting and warping is just the tip of the iceberg. Mold, rot, decay. You’ll even see how excessive heat can cause significant damage. Check it out for yourself:
Update: Composite decking has changed a lot over the years, and manufacturers are constantly improving the product. Many of the problems that plagued synthetic decking in the past have been solved. But not all companies and products are equal; always do your research, and only buy composite decking from reputable brands!