I ordered two a few days ago and I'm just (im)patiently waiting for them right now. I got the Rue de Belleville and Takeshita St. I read a lot of reviews about them before I bought them and, as everyone is saying here, the reviewers said that their hair is bad and that they're very fragile. They said that some were made with Pullip type 3 bodies, while others had the better type 4 bodies. (I think both of mine are type 4, but I guess I'll find out)
I found a tutorial where someone managed to remove the hair of one of hers and replace it with a Monique wig, and I've also seen some images with Obitsu bodies and J Doll heads. I think there's just a whole bunch of sites with similar questions and tutorials (I just Googled "j doll obitsu" and a bunch of sites came up!) The only bad thing about that is that her cute clothes probably wouldn't fit a 27cm Obitsu body. Maybe a 25cm body? :/
I hope you get one! I'm so excited for mine!
Oh, yeah, if you ever order one online go to Ebay or Amazon! The Rue de Belleville I bought, for instance, cost me $34.99 at Amazon, but was $130 at shops like YesAsia and Hobby Link Japan, and a couple others were charging that much as well. That's without shipping, too!