I called them in a bind...and they tried to take full advantage.
First, they charged me $135 just to drive to my place. Then they quoted by $1700 to fix my unit, but told me it was too old and about dead so I should replace it. Next they quoted me $7,000 - $8,000 to put in a new unit.
It felt fishy, so I called another company. The other company fixed my AC for $450...and told me I could get another good 5 years out of it.
Never ever use these guys.