My two cents worth...

Yes to part works!

They give the reader a chance to send emails to the author and maybe get one in return. That's particularly fun when you know the author is still attempting to finish his/her tale.

But with part works I want to know the story is going somewhere and the writer isn't just trying to crank up his/her supposed 'overall pop' rating!! (Although judging by your last excellent story you are not guilty of that).

The updates should be a meal in their own right, not just a nibble that is finished before we readers even recapture the mood of the story. I'm thinking at least 20k (file size) updates, however many words that is.