I'm goingto give the first book a try very soon, I think I might like them a lot. Though I will note I'm a little wary that the books will be beating the feminist drumbeat, because that is what the reviewer in Hobbit's link mentions. The culture being matriarchal etc.
Here's what he says to be more precise:
Much more emphasis is placed on the role of women in the church and in society than there was in the original time period - in some cases here the power of the women surpasses those of men. To start with I enjoyed the difference - Marian, Lucia, Matthias and Peter as disciples, anyone? - though towards the end I did feel that the book was trying a little too hard to hammer home 'a message', with the point that despite the trappings of religion and royal heritage it is really the women who have power. Whilst I liked the idea of religious and social equality in the book, I was starting to feel by the end (perhaps a little unfairly) that I had been ensconced into a feminine (note: not 'feminist'!) 'wish-fulfilment' tale.
Nevertheless at the end of the book I was pleased with having read it. I did feel that it was a 'feminine' book, with its greater depth of characters, its sympathetic (mainly female) characters, its harsher (mainly male) enemies, and limited 'action' and emphasis on women in the alternative-world society.
Would you guys and gals agree?