I would never use spun content on my PBN's anymore, that is a dead giveaway for a manual reviewer to go ahead and investigate you, but spun content works great, especially if you create doorway pages and you use a tool to redirect that traffic to and offer, squeeze page or what have you.
You have tested it, how did you test it, what was the competition like, how much content did you use, how did you spin it, questions, question, questions....
That is pretty much the main drawback to using spun content on a PBN. You are risking getting manually reviewed and having your PBN taken down.