Great, Completely Unexpected Scares!
I just saw this film in a theater. Although the actual story (unfortunately) didn't have me caring much (I found it lacking any concrete storyline), one thing that COMPLETELY stood out were the (VERY few, but) EXCELLENT scares! Simply the way they were very quickly induced in the most UNEXPECTED settings and scenes was just...perfect!
I appreciated the way the scares were thrown in your face and then taken right out again so quickly, you barely had any time to regsiter what you just saw. They say that the less you see, the scarier it is. This is completely true, and The Eclipse used this logic to it's definite advantage.
Without giving any spoilers away, I found the very first scare (car) to be THEE most effective--just the way the gentle scene and music in the backround transcended into this grotesque image and music so suddenly--WOW.
I'm a big horror film buff and have pretty much seen all there is to see with this stuff--but I think The Eclipse held some of the spookiest and well executed scares I've ever seen to date.