Chris be fair to the man’s reputation! your car has not even been to the man’s shop. I have seen Siggy give quotes based on customer request and or, on a prior diagnosis. When the car is repaired the price is much, much less than the quote, because he has found a much simpler solution to the perceived problem or the prior diagnosis was incorrect.
I have dealt with Siggy over 10yrs & hands down, the best mechanic, a perfectionist, quality unsurpassed workmanship. I have recommended people over the years to Siggy, never ever heard anything but rave reviews about his quality workmanship.
Does Siggy have an Achilles Heel? an irritatingly caustic personality sometimes, if you can get past that, you will not find a better mechanic period.
Siggy’s garage sits atop of the BMW repair chain, everyone else are “also ran” including the dealerships. The man awaits beatification in BMW heaven.