Agreed with this. You can find good ones.
Example, I asked my specialist to inspect my brake pipes under the sill of the w212. Sent me a video of them after they'd cleaned them up, all pristine and don't need replacing. £100 for good peace of mind. They could have said oh mate, you need new lines and it's only £xxx, not safe to drive, and they could have bodged some CuNi on for some quick cash.
They also said drop links probably need doing next year. I know you love to do some DIY, here's the part number is you fancy it in the summer.
Also, just had ATF service. Said wait a minute, before we give you a price, we know Merc have just dropped all their prices. Came back with £224. Very good price!
They are pretty transparent and honest with me.