I like to use Morning and Evening Prayer from the 1662 Book of Common Prayer in my private devotion. I just love the majestic language of this liturgy. I add some prayers to Mary when using it (the thing it lacks most!).
I do use Catholic prayer books, particularly the Little Office of the Blessed Virgin. I sometimes wonder if I ought to stop using the BCP and use Catholic prayers exclusively, but I would definitely miss the BCP.
Do any Catholics here use the BCP in your private devotions?