The Engineer and I often have differences of opinions on endings. The engineer has a long commute to work and he listens to a lot of audio books in the car. It's not that he likes happy ending, or that I like sad endings, or that he likes closed endings and I like open endings, It's just whether or not we think the ending was predictable/satisfying/forced/or true to the story.
Margaret Atwood has a good article about endings. It's not too long and very interesting. She goes through a number of possible story endings then says that there is only one true outcome. You'll have to read it to find out. She says a true writer will favor the stretch in between rather than the ending and tells us to worry about the how and why which will bring a story to life rather than just the what.
How do you feel about endings? Do you have a particular style you like? How do you know your ending is right for your story?