Google is getting VERY good at catching spun content so you'd better be talented at manual spins. If they DO catch you, of course they'll spank you... and hard. So anything you use spun content on is inherently AT RISK. Worse yet... Google gets better at finding spun/poor content every year. So in the longrun you're screwed. I'd weight your other options and see if you couldn't find a cheaper source for manually hand written content.
Before WordAi even starts spinning, it reads the entire article to understand both "generally" what the article is about and the "specifics" as to what exactly happens in the article. This allows WordAi to create complicated paragraph and document level spins based on its deep understanding of the article. Because no other machine has this level of deep understanding, it makes your content look human written. It is even able to correctly write high quality titles by identifying what the article is talking about.
So it is pretty hard actually to achieve unique and human readable article, but with little twists it can be done. I needed my wordai account just for FCS Networker, but I figured out that Spin Rewriter will fit perfectly for me because of their affordable price. If you need article spinner just for seo purposes, avoid them. If you want to create amazing articles, yes they are very good ..but pricey as ****…
Having struggled flat broke for 4 years in IM before I made it, I know better than anyone what it's like to never see success. I know what it's like to keep failing over and over when it seems like everyone else is succeeding online. The good thing is that I never gave up, so here I am, who know how to make money online wanting to help you achieve what I did... MUCH faster than I did. Hey it's Leo. I'm a sort of an optimist. Survived internet marketing, wonderful wife, have 2 kids. My wife would say I'm a night... I think morning. Enjoy travel, spend times with friends. Go out to parks, fishing and watching football and trees (treekeeper) are the things that I love to do.