NaNo Half Way Point

Today marks day 15 of NaNoWriMo, of 30 days (nice round number, I think they chose November on purpose).  So let's take a tally.

Are you on track?  Have you finished already?  Given up yet?  Tear any hair out?

As a writer, what have you learned through this process?  (if you've a NaNo survivor of past years, what have you learned before?  Are you still learning things about the writing process each year you participate?)

Any advice for aspiring writers?

What is your favorite part so far? (of the writing process or of your novel)