Definitely different from anything I've ever read before. An interesting way to look at how one's life might drastically change course even if only one or two variables differ. Not sure about the whole Hitler/Eva thing. It was much more interesting to read about her life in war-torn London than about her interactions with the Nazi elite, although I'm not really one for reading fictional accounts of historical people. 
 Was a bit difficult to keep track of characters' names and roles, especially the peripheral ones, from life to life. Also not sure about the plot overall. It got very depressing to read about the same character's demise over and over again, especially in situations where you were really invested in her life.