I agree with what others have said: these guys are honest, reliable, and competent. But they are incredibly expensive!
As an example, they recently changed over my 1990 Ford Taurus' air conditioning from R12 to R134a. After they did that, they were able to run a vacuum through the A/C system to check it for leaks. They discovered that the discharge hose had a leak in it. They quoted me $800 to replace it and then to recharge my A/C with R134a.
Not wanting to spend $800 to replace an A/C hose on a 24-year old car, I looked for a less-expensive option. I searched online and found two different websites selling the hose new for $50. I bought the hose and then had a retired ASE-certified auto mechanic install it and then recharge the A/C. He did the job in two hours and charged me $160. I purchased the A/C oil and the R134a he used to recharge the A/C system for about $65 from Auto Zone. (I subsequently saw that Big Lots sells R134a for $6.50 per 12 oz can - about half of what Auto Zone does.) In sum, parts and labor totaled $275, almost one-third of what Virginia Auto Service quoted me.