I picked up 9 of these books yesterday at the recycling centre. They looked kind of interesting, though these editions don't have any real synopsis on the covers. I could not tell if they were fantasy or contemporary, childrens or adults. It was only when I got them home and looked it up that I realized I had the first 9 of the series. (Gotta love those free book shelves! :D)
Read the first one last night and I've got to say it was a pleasant surprise. While the story is clearly intended for children - albeit children of another age - it was a fun read for an adult as well, full of that childhood adventure of kids getting out 'on their own', everything going badly, then coming home again and all coming right in the end.
All in all, it was a pleasant evening's read and I look forward to reading the next one and am rather glad of having these added to my library.