Well wand lore was said to be very complicated but the Elder wand was said to be pretty unique amongst the wands. In that it's loyalty always went to the victor.
I just watched it last night. Still not a huge fan of the V and Harry fight but it wasn't what I feared it was. The movie was amazingly done, well acted, great direction and stunning camera work but these movies never really feel complete to me. They try and they come close to making the books come to life but to me the movies are never able to tell a complete narrative and I'm always having to fill in parts with my knowledge of the books.
Some things kind of did annoy me about the movie. Like how they cut out the teachers saying that the students could go to safety or stay in the castle to fight for Hogwarts. The fact that they cut out that conversation made me laugh at Harry having to shove through this huge crowd that seemed to move with him. Then there was the room of requirement. In the book the room that was opened was a place for students that had to hide something, a piece of contraband candies, love letters from their secret girlfriend, soiled sheets and so on. But in the movie the place was filled with furniture, lamps, tables, dressers. I just couldn't stop wondering how often the students needed to get rid of a bulky pieces of furniture.