This has been my experience too. Furthermore, I do not recommend Spinrewriter because I found a major flaw. The save feature does not work so that you can finish editing your article at a later time if you choose to. So if you don’t finish spinning your article like you want it all in just one sitting, then you’re screwed because when you come back more than likely your work won’t be saved where you left off, so you then have to edit and tweak manually. This is what I’ve experienced time & time again with this flawed software. I contacted spinwriter support about this and they didn’t deny the problem or even offer to fix it. This is poor support and obvious that key features such as this do not work as advertised or as presented. Therefore, I DO NOT recommend Spinrewriter.
Spin Rewriter integrates with almost any SEO software. This allows you to post high quality articles quickly and easily. The only drawback is that you only get something like 300 API requests every 24 hours. You can quickly burn through this if you’re doing multiple campaigns. The developer does not currently offer a plan for heavy API users but maybe they will in the future.