I've taken both of my Civics to ACURA before for work because I had a friend as a mechanic there. I only trust him to do work that I don't do. But it wasn't a problem taking it there, and it won't be a problem as all work will be noted in their system. As for warranty work, only ACURA will flip the bill on that if you ever have issues that need taken care of. Honda will not want to pay for that.

-Victor