Summary of Reported PVC Decking Problems:
Despite warping & rot resistance, PVC boards can be very fragile.
Can't be stained, or refinished. Some brands can fade faster than others depending on sun exposure.
Claims of stain resistance don't mean that it won't stain. Lighter colored boards will show stains more than darker PVC decking.
Toxic gases will be released when burned.
When exposed to the sun, PVC will retain heat and can be hot to the touch. Be cautious when walking on PVC deck boards with bare feet.
Very expensive. Can cost more than composites materials and Ipe decking.