My son has read this series - and I read them too! It is a fantasy series based around the life of Will, a fifteen year old who is apprenticed to (warning, spoiler alert) a ranger (not much of a spoiler, I know!). Will has dreams for what he wants to do and be - but is forced into another path (being a ranger) which he eventually appreciates is the right one for him.
At the same time as developing his skills as a ranger and growing up, he is engaged in some of the troubles in his country, Araluen (a thinly disguised England).
The book(s) are pacy and well written. While Will is the main character, other characters are well drawn and develop over the series, as do the relationships between them, in a way that I believe is appropriate for the age group. You also get to see some foibles and weaknesses - they aren't cardboard cutouts! The fantasy genre is managed without magic (despite the title of Book 5, The Sorceror in the North) - "success" is about values such as character, skill, courage and teamwork - oh and skill? the message there is one of 1% inspiration, 99% perspiration, as we see Will and his friend Horace, practise, practise, practise...
One small downside is that some of the books - eg Book 1 - stand alone, but some of the others flow into each other a bit more. I guess that is good for marketing (!) if a little dissatisfying when you finish a book and feel like the story is still up in the air. Just as well the author is getting them out very quickly!
The age recommendations on these books are appropriate. The length is good for this age group too.
My son was clamouring for the latest book - book 5 was released a fortnight ago here in Australia - and he has read it with great enthusiasm. Several other children in his class are reading them and they have greatly enjoyed discussing them and sharing them around. It is great to see that buzz around a series of books.
There should be more like this one!