Hi,
I don't have any reviews yet on Freelancer. But I am experienced in writing on all kinds of articles, SEO or otherwise. I am a single person writing the articles (as opposed to a writing company) and I cannot bring myself to write substandard articles. So, I do not have a great speed to deliver more than 2 to 3 articles per day.
I have attached a sample article here along with a PM.
Thanks.