I saw episode 15. Probably my favorite episode so far. To see Haruhi-chan look so feminine is a refreshing change to her tomboy appearance. <3 She seemed calmer as well.
Also, I loved how they showed the development between the twins and Haruhi. She really helped them out and I love to see that in the series. And the piano scene <3 hanyaan. I am forever a fan of music. If you haven't seen this episode yet, what are you waiting for?! Go watch it! It's excellent!