Two stars is being generous.  A lot of the prompts were repetitive or just variations on the same basic idea.  While there were a few gems in there that sparked some interesting responses from ChatGPT, the overwhelming majority felt very generic and didn't offer much beyond what I could come up with myself.  It saved me maybe a half hour of brainstorming, but not worth the price.  I expected more originality and a wider variety of prompt types.  Disappointing.