Most of the cheap ones will not fit perfect. If your really picky and you want near perfection out of a carbon part your options are pretty limited. I'd be willing to bet that the one the AMS sells is probably a good part, but it will come at a price. Good luck in your search.
Yes I agree that AMS has the perfect trunk .. But I don't want to pay that much so I am looking for people who bought the cheaper ones if they could support me with their vendor or send me a link of the sale or something..