Do you balance your props?

Here are two schools of thought on the subject.

In favour:

http://www.youtube.com/watch?v=N02NHYrpA0g

Against:

http://www.youtube.com/watch?v=yhYcDuMLJb0

Here's how to balance a Prop

http://www.youtube.com/watch?v=g0rgqU7ivyQ