Only standard WordAI spinner showed 12% match for me in Copyscape which is very good I think. Also I will add that for SPAM links in general you don’t need any quality at all. if Google crawler can’t find connection with other spinned articles – goal achieved. Sorry, but I don’t see that with expensive spinners as Copyspace shows that in plain sight.
Spin Rewriter 9 is probably the best product in the market… I get great EPCs promoting it and, what is most important to me is that my clients actually love the product. Very low cancellation rates & practically no refund rates. All around it’s a fantastic product — if it fits your business at all, then you definitely have to get on board & promote it!