I had a 10 year old car that had an oil leak, a transmission leak, and was having acceleration issues. The dealer service department gave me some unconvincing and extremely expensive stories. They diagnosed the acceleration issue as a transmission failure, requiring complete replacement of the transmission. I took the car in to Herndon Reston Transmission looking for an honest and complete assessment of my car. My plan was to decide whether it was better to repair or replace my car. And Herndon Reston Transmission provided it. They went through the car with me and looked at what would need addressing in the next few months and within the year. They also identified those issues which they couldn't know what was happening without actually taking things apart. For each of those issues, they identified possible causes and costs from least to worst case. The acceleration issue, by the way, was a bad coil. The transmission was fine. The leak was due to a stripped bolt hole when the transmission was last serviced. (By the dealer service department.) A new gasket and stripped bolt kit corrected the leak. In other words they provided me with an expert, complete and honest assessment. And which matched my 35 years of experience with cars far better than that of the dealer's service department. They were also up front on costs, benefits and risks, and, when pressed, how they would act if they owned my car. Although it was fully repairable, I ended up replacing car. I would most certainly use them again. (And plan to do so.) Further, I recommend them for those interested in getting the advice and work of experienced and forthright mechanics.