Having been alerted to this "series" by trusty MobileRead, I have started the first.
I must say, in a way, I can see why Ms. Rowling ( whom I had the honour to meet once, charming lady) abandoned legal action. ( But I still think it's a bit of a cheek ! )
While OK in a bit of a "ho-hum" way, the "fake" represents no real threat to her original creations.
In fact, they might encourage readers to go back, or even discover, the real thing.
For example, quite apart from the quality of writing, and much else, I find one interesting difference.
That is that J.K's explanations or justifications for complicated things, or concepts, which arise in her magical world, seem so much briefer, concise, and sometimes unnecessary, than in the James Potter work.
Which shows, I feel, the gulf between the two projects. But this is not, I'm sure, meant in any way to rival the original, and stands as the author hopefully intended, a fan's non-profit "homage".
So, while not finding much of a "ah good, this goes on where Harry left off" feeling, there's not much need for a book-burning !