What's the American system like?

Over here, although we went metric in 1980, we're still taught a few Imperial measurements in school. As a result, a large majority of the population uses a strange mixture of metric and Imperial.

For example, I'm much happier to work things out in feet and inches, stones, and miles than metres and centimetres, kilograms, and kilometres. However, I use litres and millilitres, as well as centimetres, metres, kilograms, grams and whatever else if the situation dictates. Basically, I can swap between the two whenever I feel like it.