I do not have the same childhood attachment to the Magic Faraway Tree series as others seem to have. Instead, I read the whole new-to-us series to our 6-7yo son over a 12 month period. Spoiler alert: he adores it.
The Magic Faraway Tree series was originally penned by Enid Blyton. The first 4 books The Enchanted Wood, The Magic Faraway Tree, The Folk of the Faraway Tree and Up the Faraway Tree are all fairly different. After that, we get a series of cash grabs (also penned by Blyton) that seem to be repeats of what came previously.
Jacqueline Wilson's a New Adventure is a faithful rendition of the originals. She introduces three new children and modernises the setting, doing away with a lot of the archaic gender roles that Enid is famous for. She also adds a bit of edge, and the lands that the children encounter gradually get more interesting as the book progresses. I really enjoyed her treatment of the Faraway Tree cast, who actually feel more rounded as people, and have their own themes of growth and conflict throughout the book.
Some reviewers wrote that there wasn't an overarching story. This both is and isn't true. While it's correct that the children only tend to visit one land per chapter, it's also correct to say that their encounters have longevity. Themes and experiences from one land carry over into chapters that follow, and there is a lot of character growth among the whole cast. This is indicative of a bigger stylistic shift between Wilson and Blyton, where Blyton would often focus on adventure (stuff that happens) and Wilson puts the emphasis on experience (character development).
As a side note, we've now read 11 books of the Secret Seven, and Blyton's rendition of Suzie and Peter never actually changes. With Wilson, that would be impossible.
If I have any critique of Wilson, it is that her sentence structure is rather long-winded compared to Blyton's. Chapters simply take longer to get through, which then affects the pace of read-aloud sessions. In addition, Wilson's style is more detailed. Frequently, with Blyton's books, it's the things she leaves out matters as much as the things she writes in. Blyton will happily introduce three characters, but then forget to describe what they're wearing, because she's far too busy chronicling their adventures. This then creates a certain kind of momentum in her stories, where you end up filling in those gaps in your mind.
Wilson's style is altogether different and more descriptive. Hers is a lushly coloured world that doesn't want to be rushed. As a result, reading Wilson and Blyton feels very different. Wilson's style is painterly and methodical, while Blyton's is more sketch-like and playful. As an adult, I really appreciate the depth of feeling that Wilson brings to this world and characters, but readers hoping to re-experience a Blyton 'book' may feel some whiplash.
And yes, other reviewers are right in pointing out that most adventures happen within one chapter, but it's worth pointing out that each of Wilson's is about 3x the size of Blyton's.
Age range: Would our 6yo son have loved this as much as he loved the first Faraway Tree books? I am not sure. Wilson's focus on character interiority might have been too much for him at that age. We had to (temporarily) pause the Famous Five for that same reason.
Does he love it now? Yes, those 12 months of cognitive development have made all the difference.
Would he read this book on his own? I doubt it. Our son is (currently) a very reluctant reader, and Wilson's style is so verbose that he'd be intimidated. Would he read Blyton's original series? Maybe, but at the moment he's obsessed with Diary of a Wimpy Kid (which incidentally also has that focus on character interiority).
For parents starting with this series, I would begin with Blyton - not for the sake of nostalgia, but because her work will be easier to follow for tiny children, and the kids can then grow with the books.
4/5 from me and 5/5 from my son, highly recommended.