Before I went on my last trip, I finished reading Eclipse. I definitely enjoyed it.
The plot was not totally identical to the previous books as the first and second had been, but it also was not totally different and weird, breaking from the established structure of the books. The action was definitely interesting, but also varied from what we saw before.
My feelings are much more complex about this part of the story. For example, in the beginning I was disgusted by Edward's controlling attitude, but I was impressed with him as the story evolved. I initially really enjoyed going into the background of more of the characters, but upon reflection there was no really purpose within the story to do so... it simply wasn't believable to me that the characters wanted to share with Bella; instead it felt like Meyer only wanted to share with the reader.
My favourite part of the book was the last five or six pages; I would recommend it just for those!