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That pricing is shockingly low. Get references. if they are good. Get it done before they realize they are giving it away. About 8K for me in the SF bay area by a top guy.
That's the lowest price quote I've seen by quite a margin. I'd make sure they are authorized to install and fully warrantied. If it checks out I'd do it. Even if they don't do a perfect job I'd feel good about it (as long as it's a pretty good job).