A lot of young adults here in Holland are fan of the series, even in my internship class there are children who adore those books. I haven't read them, but I hope I get the chance in the Summer!
On to the covers.. I adore the US covers, they are pretty. I like that it's simple, one colour in the background and then a doll who represents a girl in the book (I think). But they did a amazing job with the Dutch covers too, all of the girls are on the cover which I think is great. And the stripes are fun too, some candy wrap up. If I had to choose I would pick the US covers. I just like that there is just one colour at the background that really pops out when you look at them.
Here you can find the description of the book!
Would you pick the Dutch or US cover?