*bump* because all the threads are old, and I just had a positive experience with AA.
Put in a service request via the Website on a Sunday afternoon. Call back first thing Monday morning, and had a repair crew at my house by 1030!!! That is enough for a good rating. But, it gets better: After diagnosing the problem, he told me it was a simple repair and that it would really be a waste of my money for him to come back out to install the part. So I ordered the replacement valve and am back up and running in 48 hours. I would definitely use them again.