I have also finished Umineko no Naku Koro ni Chiru (EP 5-8) now, and the whole series as a result. In fact, all of When They Cry (Higurashi + Umineko) even. Still got those two fandiscs left, Tsubasa and Hane, and also the fighting game expansion - Ougon Musou Kyoku Cross. But other than that, I'm done.
What to say now then...
I could not possibly be happier about having read and experienced When They Cry. These VNs were perfect for my taste. They are my top favourites (Umineko/Chiru being #1), for sure, absolutely, with certainty.
As for Umineko and Umineko Chiru specifically... well