The only prob I see is if someone has a bad run with a recommended mechanic. Example, one mechanic who I used to think is great is now having some mental breakdown and abusing his clients. I won't go back to him now. I'd hated to have his name in print on the internet recommending him, and have someone else have a raw time with him.
But in essence, I think if you are confident of whom you recommend, then a list would be ideal. And names can be taken off too if a problem arises.
Foxtrot Oscar Romeo Delta X-ray Foxtrot