Hi. I know I'm a bit late to the question, but Google favours unique content. Google will issue warnings in GWT if you have just copied and pasted from the page content. You should be looking to write a compelling message that informs viewers of the content of the page and urges them to click through to read more.

I found this [relatively] recent article useful. I just so happen to be looking for more examples when I came here.

http://econsultancy.com/uk/blog/62553-33-examples-of-great-meta-descriptions-for-search