Bad experience! Hygrade came to clean my chimney and did a decent job. But they told me that my chimney was falling apart and would have to be rebuilt. It would cost $2,700 to tear the chimney down and rebuild it. Well, when you get news like that, you get a second (and in my case third and fourth) opinion.
I had three other chimney contractors come and look at my chimney. And they all told me the same thing: it's as sound as the day it was built. If I had listened to Hygrade, they would have torn down a perfectly sound chimney and charged me thousands of dollars.