I began taking my cars to Patrick soon after he opened. I was in a predicament, I'd just been advised by the mechanics at HBL that I needed to replace the transmission in my c280. I called Patrick to ask how much he would charge for a reconditioned transmission and he challenged the diagnosis. I was doubtful and moved on. He called me back and said he was so confident he was right that he offered me a free inspection of the transmission. He was right and as a result my imminent $3000 reconditioned transmission turned into a $150 transmission flush thanks to Patrick at HBL. I've since sold the C280 but still take E55 that replaced it as well as my wife's ML320 to HBL for all our mechanical needs. I still occasionally check against other mechanics and he's usually cheaper and most importantly I trust his work. Most recently my wife accidentally parked the E55 too close to the curb and when she pulled back the front bumper unclipped. My collision center quoted nearly $700. The guys at HBL had me back on the road in 2 hrs for $159. HBL is not convenient for me. I travel from Reston to HBL in Rockville, an ungodly journey in the morning rush but I figure its still less time than making multiple trips to someone closer but not as accomplished as HBL.