It's funny, I'm not much of a Wolverine fan, but I love X-23. Wolverine is a stubborn, rude brute. Sure, he is better than Cyclops, but that's not saying much. He always attacks before thinking, which may come in handy half of the time, but it ruins things the other half. X-23 is also stubborn, but she is a lot nicer (despite having a similarly awful past). She is more calculating, thinking before she attacks. Of course this can get her in trouble, but once she does go into battle mode, she is a hardcore instinctual fighter. Also, Wolverine is quick to kill, whereas X-23 will carefully debilitate her enemy, and not kill them. Whereas Wolverine fans the flames and gets people to go all attack mode, X-23 tries to stop fighting and get people to work things out verbally. Don't get me wrong, X-23's attitude is not all roses. She has anger deep inside her, but she chooses to control it. All in all, I love her persona, and X-23 has become one of my most favorite Marvel characters. 
 The book itself is a great introduction to X-23. The story does start off in median res, but there is a lot of character backstory through the dialogue. Also, there is a flashback between Logan and Laura that feels particularly poignant. The only thing I am lost on is what happened to Logan? The book tells that he is dead, but I have no idea how that happened. I thought he was still teaching X-Men at the Jean Grey School for Higher Learning. I suppose I could read Wolverine and the X-Men to catch up, but not being a fan of Wolverine, I don't have a strong urge at this moment. All we know is Wolverine is dead, and he has passed along the mantle to his clone/daughter. 
 The book actually makes a hilarious points about her replacement of Wolverine in a conversation between X-23 and Doctor Strange (Yes! Doctor Strange is in this book!). X-23 says, "I know there are people who disapprove...guys on the Internet mainly." I laughed out loud because I can just picture all the fan boys expressing their Internet rage upon finding out that the All-New Wolverine is a woman. 
 All in all, I strongly recommend The Four Sisters to lovers of X-Men and lovers of strong female characters. Laura Kinney is no push over. She stands her ground and she is bad ass for it. I definitely look forward to reading more about her and discovering more about her past. Doctor Strange does glimpse briefly into her past, and it looks intriguing indeed. Also, I would not be able to stomach another Wolverine Origin story, so an X-23 Origin story would be a nice change of pace. :)