I think it is better to just come up with your own content. Most of those type of programs that are designed to make things easier, really just make things more difficult. You are right. The more you write, the more practice you get, and the better you’ll become. I have been writing for years myself, and I have never needed any content generation programs.
"I want to say thanks so much to the developer of Spinner Chief! It really makes my jobs easier. Before I use Spinner Chief. I always make some articles by my self. I do that to get some unique articles and to get high quality backlinks. I'm very tired to do that. So, I searched in google the software which can help my jobs. The software which be able to make an article become unique by spinning it. I found a website which offer a spinning tools, but it have us to pay for it in the large amount. I was frustated. Finally, my friend told me about Spinner Chief. WoW! Very Amazing! It's free! And the most important, IT'S VERY POWERFULL! So this product is HIGHLY RECOMENDED!!You won't regret to use this POWERFUL TOOLS!"
That’s really weird. I have tested WordAI and Spin Rewriter with Copyscape and the results were always 80%+ uniquness, even 90%+. I don’t know how u spun the content to achieve such low results, but this is definitely way too bad. As for the block spinning, I have to be honest, this is the first time I’m hearing of it and I will have to check it out when I have a bit of time, but generally, yes, in the best case scenario, you would manually touch your Tier 1 content to make it 100% human readable and as unique as possible. For lower tiers, you can do pretty much anything, but again, the better quality of content, the better results you will have. That’s in my opinion and experience.
We all know that content is king on the internet. The internet itself is made from many different kinds of content. Content is also the key to making money online! So it will come as no surprise that many people have been trying to find shortcuts to making as much content as possible in the least time possible. Over the years I have seen many different kinds of software being released that claim to be able to make the process of creating content easy. But there was always a problem…
Imo it is not possible for google to detect properly spun content, it is not worth computing power it requires. They can do this using ngrams for example, but it is uses a lot of queries. And for example article spinner I coded beats this algo, so google cant detect that the content is spun. Manual spinning is also good but it takes more than 30 minutes per article. 
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