We tried and we tested. We spinned and we unspinned. After all said and done here, I think you should have already made your choice about which spinner is best for you. If you will be doing a lot of manual spinning, then The Best Spinner is probably the best choice. On the other hand, if you will be using the spinner just for automatic spinning, and you have enough capital, WordAI is the spinning tool for you. But if you are still on a budget, Spin Rewriter is your spinner. However, if you are going to be spinning text in languages other than English, you might want to go with either Spinner Chief or Chimp Rewriter. The choice is all yours. You can now make an informed decision.
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.
There are some 'free' article spinners out there that require you to enter your text with properly formatted 'spintax' in order to create the end result. But how you need a totally separate tool to create this machine formatted text, so how is this really useful to you? Spinbot does all thinking for you, from taking in the context of every phrase to creating additional textual content that is as readable and meaningful as the text you originally entered.