I recently purchased 100 spun articles related to my niche. According to the Seller, who has a five star rating on on warrior, several niche related articles are scraped and the paragraphs are swapped around to create a new article made up of parts of other articles. They are 100% Copyscape approved.
I posted all of the articles to High PR Society, posting to PR 2 or above blogs and set each article to be used/spun 30 times using one link per article.
Concerned that non of my keywords had moved much after one month I took all 3000 post URLs from HPRS and loaded them into Nuclear Indexer (a service I highly recommend) to discover that after two weeks of indexing time only 7.41% of the URL's are indexed. In my experience a 7.41% index rate is extremely low and indicates poor quality content.
To try to increase the index rate I than loaded the URLs into Dripable and blasted a couple of rounds at them but this made little difference.
This suggests to me that either there is a problem with the HPRS network or the spun content is an issue. My guess is that the spun content is the issue. I might even stick my neck out and say that Google can easily recognize spun content and devalues it.
Personally i'd rather pay the extra for BMR where the indexing rate is 100% and the article 100% unique.