Since these are about 5 inches tall...
I have a few of these. One I've already beheaded and done a head transfer to a Monster High body that the head vanished on ages ago (one of the older, articulated bodies). The other two, I just got today, and one I've kinda fallen in love with to the point that I'm making a fabric double to make outfits for her (Sallee, btw.). I'm debating about doing another head transfer with the remaining doll.
Pluses: They have VERY lovely hair, and it's a good quantity too; They fit in a pocket; the outfits and shoes are swappable; the one piece shirt/dresses fit on MH bodies with a little futzing (gotta take the hands off the MH doll to get the tops on, but that's it), they've got sweet faces; some of the same molds get used for the heads/arms, but the skintones differ between dolls and so do the eye and hair colors; there's 36 in series one, 12 characters, three variants of each character; the boxes can be used to store the doll clothes and accessories as well as the doll itself; the dolls come fully dressed, with specific hairstyles and outfits for each variant of each character; the clothes are all swappable between the dolls in the line.
Minuses: Limited articulation (Shoulders, hips, and head. Shoulders and hips have a great range of motion though!); (minor) They're blind-bag, and I haven't figured out how to tell which girl you're getting in which box; dolls may not be available everywhere.