I received a review copy of spun articles from joker and here's my honest review.
The articles are readable, but you stumble often while reading through them. I noticed a number of grammatical mistakes here and there.
For example:
"The innovative article writers are surely like and use the minimalistic Jotter pad application. "
Note that they'll not engage human readers, but does it what they clearly promise in their thread. It's not the top quality, but has the keyword in the article a few times.
These are great stuff for link building, considering the price as well, I'd rate them 9/10.
Good luck with sales.