Yessss. I bought my car from my mechanics. Shortly after we got it, the heating core went out - since it was shortly after we bought it, and they love us, they replaced it for free. It would have been a good grand of work.
Also, they let us bring in our own parts. My dad bought the struts for his car off partsgeek.com (great prices!!!!!) and took them in to use their tools to put them on.
It is seriously worth it to cultivate a relationship with a good mechanic. Also, it is super fun to go and hang out at the shop and check out the cars they are working on. Sometimes, I think about asking them if I can apprentice there - then I see dissembled engine and freak out.
But you get to see cool things like an engine with a hole blown through it from a ... something. Some sort of rod/piston shot through the engine, I believe due to not being fed oil. It was so cool.