Higurashi is a great series.
I'm slow though, and still have 2 episode of Kai to watch lol.
Biggest mind fu*k since Evangelion, cutest art since Lucky Star, and some intense violence not unlike that found in the Saw movies.
Also, I love how they don't just come out and say everything... for example: How in the 3rd story arc, episode 9, it opens with a body in a bag. They lead us to believe, with blond hair, and the fashion of murder, that it was Satioshi... however, eagle eyed viewers might note that the body had a star shaped tattoo on it's hip, which we later see on Rina. So while they want us to think it was Satoshi in the bag, they were actually showing us the reason for Teppei returning, which we later see in Kai. Though honestly, I still have no clue why they would kill her in that fashion...