It's junk. There's a reason it's so cheap.....they actually guarantee that it will fade! Of course the degree to which it fades may be more than what they say.....Why? I've always had wood decks but looking into composite, so curious to hear thoughts.
I've read lots of horror stories and talked with people who have bought it. They wouldn't do it again. If you are leaning toward a composite - and with the price of lumber what it is right now, why wouldn't you? - make sure that it is a capped product (capped with PVC). If you want to know more PM me, I'd be glad to share what I know.