The biggest different between Derek and the dealership is that Derek will fix all of the things that have and WILL fail on your BMW, whereas the dealership will only fix what you say is wrong. Derek prevents me from having to go back for service by fixing the things that he KNOWS will fail on these cars, because he has been fixing them for so long. Example: the dealership fixed my window regulator (common E46 failure) under warranty because I told them it was making noise. Years later, I noticed water pooling on the floor mat during hard rainstorms, and asked Derek about it. He said "Did you ever have a window regulator replaced? The dealership will replace the regulator, and damage the vapor barrier in the process, but they never bother to replace it. I always replace that inexpensive vapor barrier when I do the regulator repair." That's only one example of his amazing diagnostic skills. Derek has proven to me, time and time again, that BMW's preventative maintenance schedule is a bunch of marketing garbage. "Lifetime fluids" becomes obviously ridiculous once you've seen the condition of the fluids that come out of the transfer case and the diffs on an XI. And the thing about Derek is (if you're interested in this stuff) he will save those samples to show you later, he will take pictures of your engine components as he is fixing them, and he is willing to talk for as long as you need to fully understand the condition of your vehicle. Derek recently replaced BMW's version of the PCV valve that he has seen fail on numerous models. Coincidentally, my neighbor scrapped his 325i because this system failed on his car and ruined the engine. It's not cheap to replace the system with the updated BMW part, but it sure is cheaper than a new engine. I have gone to other non-dealership service locations in the Seacoast area as well, but Derek's flexible after-hours schedule eliminates the stress of taking time off work to drop off and pick up your vehicle. The number of nicely-maintained BMWs "waiting in the queue" at his location is a testament to the satisfaction of his customers. In closing, PASSION is an understatement for the service Derek provides, and I have no plans to go anywhere else.