DH used to work near this mechanic and one day had a problem with his car at work. The mechanic/owner fixed it for him straight away and for a great price. We have used him ever since, for both our cars, and always find him to be courteous, accomodating and trustworthy (no 'hidden' problems that need 'fixing').
Recently we had a problem with our car and my FIL talked us into taking it to the dealership to get fixed. They quoted us $500+ to fix the car. So we went away and sourced the parts ourselves and took it to DMH Automotive. Daniel (the owner) was more than happy to fit the parts we had sourced, return the old parts to us and did it all really quickly so we could have the car back for the Easter break. Total labour cost was $250, compared to the $500+ at the dealership.
We always feel we can trust Daniel and he has always charged a very reasonable price. A good mechanic is hard to find and finding one you can trust is even harder - but we think DMH Automotive is FABULOUS!
We've never had to try any special tricks, they just seem genuinely fair. However, sourcing our own parts worked in our favour (he told us that he's ordered parts before and had his supplier order them from the dealer, adding their mark-up on top - ending up costing everyone more!)