I had it for my 2009 MacPro Tower. I had two repairs done with it. So that more than paid for the cost.
But so far, no one has mentioned how very useful the telephone support is that comes with Applecare for when you're having problems. Two years ago, out of nowhere, I had a really screwy series of problems with Mail, and the regular telephone help line people quickly passed me on to a full time Mail support person. He was fantastic. Talked me through an interative set of potential solutions to the problem over a three week period of time. Even gave me his direct phone # to get back to him personally to continue trying to resolve the problem. He finally got it. That software telephone support alone was easily worth the cost to me.
Brad