Anyone using Content Cucumber ?

Stumbled across these guys. About $500/mo for up to 400 words/day. Business days only. That can get you up to 8800 words/mo or about 22 articles. The benefit seems to be you get a dedicated English writer. Just not sure of the quality or actual output. Cant find a lot of reviews about them.
Anyone using them?

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Not used them personally, but what's the advantage of using them as opposed to hiring your own writer? Do they also proofread and edit, or do you just get the writer?