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I have not dealt with them but I do like that spoiler, for me it is either the CF Nismo type from Evo-R or the Varis Arising 1. (it is the top duck tail type in this picture)
It seems like the Evo-R is a much better deal when you consider the Varis is around $500 and it is pretty simple. On the otherhand that is why I like the Varis, because it is simple.
Chris