One neighbor put composite on his deck and ripped it up after about 5 years. It drooped between 16"oc joists and was hot on his feet. His was the Lowe's standard composite. Add to that the additional cost for the special fasteners, and he was more than underwhelmed by it.
The neighbor on the other side had the hidden fastener, tongue lock composite put on the deck off his kitchen which is over his patio when the house was built seven years ago. Other than some leaks that never got fixed before the developer went bankrupt, he is satisfied with the material itself.
Guess it depends on the quality and type when going that route. I went with the pt boards and the coated deck fasteners and have been happy with the results. Does require periodic maintenance, but the screws are still holding good after about 8 years. I am not in a salty environment, though, which you may be.
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