Kilogram / 3 is .33 kg or 333 grams, not nearly as hard to figure out as a third of a pound. I had fully learned the Imperial system when Canada switched to metric. Then I used metric. Then I moved to the USA, back to ounces, inches, gallons. I always found metric simpler. The only thing I don't find more intuitive is liters/100 km vs mpg.

Honda, Sony, Mercedes engineers all use metric right? Clunky? OK.

I think you are right MthGM, I rented a Car in Gatwick when I went to the UK. It took about 10 minutes to get used to the other side of the road.