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.
Now, I will use the “Very Readable Content” settings suggested by WordAI to see what it will come up with in comparison to the original text. It took about 30 seconds for WordAI to spin this small piece of content so you really know that there’s a lot of processing happening on the back-end. The content that WordAI generated is calculated to have an average of 94% uniqueness (you can learn more about how WordAI calculates this percentage here) and here is an example spin generated from the spintax:
From personal experience Spin Rewriter is the best! like I still use it today. Its so easy to use (Just copy paste and the program do everything) Because of this tool I managed to schedule content and articles for 3 years, do you know how much time and money I’ve saved?!?! A LOT!!! Also i high recommend you pick their mothly plan if you are still in doubt