My daughter just turned 6 and had a "lego" party. When we planned the party we did not know these sets were coming out. She has been building lego with her dad since the age of 3 and is a great builder. For the party we dumped a bin of legos on the ground and watched 11 kids, boys and girls, build nonstop for an hour and a half. It was the most low maintenance party we've ever had.
My daughter got 4 of the lego girl sets for birthday presents. She LOVES them because of the specialized pieces, such as the animals, insects, little girl minifigs, and building the specialized pieces such as the robot in the inventor's workshop. I anticipate at some point she will have the entire collection of this line. Yes, truthfully I was disappointed to see the beauty shop and hope lego comes up with friend lines in doctor, lawyer, engineer, bus driver, etc. sets that don't totally stereotype girls.
While I understand people screaming "sexist", I feel at the end of the day it's my job as her parent to teach her about those issues and to ler her play with toys she enjoys. I don't think she thinks of gender lines amongst her toys and it's my job to teach her she can play with any lego she want and as well as her brother. I appreciate lego taking the time to research this issue for girls and would love to participate in that type of research in the future!