On a side note, I want to tell you this, because it is not in the Spin Rewriter FAQ as far as I know, but you will be limited to 300 API requests per day. This has proven to be more than enough for the number of projects we are setting up every day, which is a lot, so I don’t think you will have a problem with it either, except your link building campaigns every day are in the hundreds.
Some article spinners out there require you to enter your text with properly formatted spintax to create the end result. To create formatted spintax, you'll usually need another tool. But Article Rewriter by Small SEO Tools doesn't require that. Instead, it does all the 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.
I use Spinner Chief service, because it is able to rewrite content automatically, it doesn’t make load of mistakes that other spinners do, and it is much cheaper and it takes under 10 seconds to rewrite a 400–500 word article. And after reading the article you sometimes need a few minor edits which can be done on their spintax editor. I guess it is cheap because it is a new tool, but I took the advantage of it and get it for a low price. It is also nice because everyone can try it out for free.
Spin Rewriter completely changed my mind about article spinning software. I've tried nearly every one that's come on the market (seriously) and wound up just rewriting articles myself since each product basically made me do that anyway. So when I tried Spin Rewriter, I was a little hesitant as I'm used to every product always having a huge hype with tons of testimonials from people I've never heard of. With SR 4, my mind was completely changed, and I was amazed at how easy the software was to use, but also it really focused on proper spelling and language. With many articles you see online, it's obvious it's spun as it reads like something automated and off the rails wrote it. With Spin Rewriter, it truly is able to sound real with quality writing. You have to put a little effort into it for the best results, of course, but unlike all the others it's worth that little bit of effort. I can't wait to see what changes are made for 5.0!