I am a writer for ProficientWriters.com. I have finished numerous projects for them over the past few months. I can't vouch for the other writers, but I am a native speaker of English and have done well there. I've gotten some compliments and a couple complaints from high-school students too inarticulate to state clearly what they wanted.

I make about $10-$12 per page (never less, sometimes more) of double-spaced Times New Roman with one-inch margins and generous header-space per MLA format. Most of the assignments are 1-2 pages, but I have done a couple of $50 - $75 jobs as well.

Proficientwriters seems to be one of the better outfits, although I have learned to keep a close eye on my Amount Due page. Their non-fluent Support staff can be rude and unhelpful to the writers, and the process of getting selected to write a paper is not at all transparent.

I recently applied to BestEssays and passed their test (probably everybody does). But their page-rates are ridiculously low, $3 per page for difficult assignments. I would never write for them and will probably just let my account lapse.

My advice for people searching for a good writing service is to try to become a writer there yourself. If you succeed, check out their pay rates. If they are below $10 per page, don't touch them -- their writers will give you the quality they were paid to deliver, and they will in turn probably be ripped of by their company.