I have recently read the 3 Green Rider books, by Kristen Britain (Green Rider, First Rider's Call, and The High King's Tomb). It seems like there might be more, since it didn't bring the series to a definite end, but I don't know if she is writing more or not.

Since these books are actually pretty popular and aren't as obscure as some of the other book serieses i like, i decided to make this thread. If there is already a Green Rider thread, i'm sorry. But I searched and didn't find one.
So, have you read these books? and what did you think of them?