Pros & Cons of the new Western digital Caviar Green Drives?

I am about to buy a new hard drive. Its a 2 TB hard drive from Western Digital. I am familiar that western digital usually produces good hard drives, but I am unfamiliar with the line of Green drives and haven't really found much reliable info in the form of reviews. Any tips, suggestions, or valuable info that would help me understand whether or not its worth buying this drive or not.