I am really glad I purchased McKenna (renamed Alex). I am very pleased with her mold/hair colour/eye colour combo, as I was a bit worried it may irk me like Elizabeth did. However, the hair is a darker enough colour that is works really beautifully.
I can see what everyone else has said about McKenna's wig. It is really a beautiful thick and silky wig. I received my McKenna around the third week of July, so like others have posted about the changed wigs, my McKenna doll has the short hairs in the back, which I am glad American Girl fixed. The only minor issue I had was the stuffing was a bit off, so her head was noticably tilted in a way that irked me. I played around with pushing the stuffing around her upper body, and the tilt is much less noticable.
I also do think that AG also fixed the falling legging issue. In the short time McKenna was in her original outfit, I did not see this issue of her leggings falling when she sat.
Overall, I give the doll an A. I understand the qualms folks had about her being to similar, but for me, she does not have too light of hair as Elizabeth has, and she actually has a playable hair length which Chrissa lacks. She is by far a keeper for me, and probably close to if not my favourite out of the GOTY dolls I own.