Synthetic Oil - good or bad?

I use synthetic in the new car that calls for it. I use dino diesel in the diesels. I use race oil in the race car, and dino oil in the other old cars.
I DONT use synthetic in transmissions or rear ends. Ever!
Edit: "synthetic doesnt cling as well" is exactly what i was told by a friend who ran a one-man rearend shop. He refused to warrantee his work if the customer insisted on synthetic lube. He built Lots of racing nine inch rears.