Foster uses modern and historical/mythical persons to flesh out the strengths he ascribes to each branch of protestantism. While this approach will test readers who look down on the stories of the saints of old (he relates St. Francis' reasoning with a wild wolf in one chapter) if you can put aside modern protestant prejudices against christian mythology you'll be much the better for it.
I found the book to be a refreshing approach to integrating the major movements in Christianity. I am more mindful of the traditions of faith I did not grow up in and am attempting to incorporate their strenghts into my experience of Jesus Christ.
In this landmark work, Foster examines the "streams of living water" -- the six dimensions of faith and practice that define Christian tradition. He lifts up the enduring character of each tradition and shows how a variety of practices, from individual study and retreat to disciplines of service and community, are all essential elements of growth and maturity. Foster examines the unique contributions of each of these traditions and offers as examples the inspiring stories of faithful people whose lives defined each of these "streams."