So far it has extended the power supply so I can now be 6 feet away from the wall and plug things in. In fact, now I can plug 3 things in where I once could only plug in 1. Bonus features include the flatter plug design and the little slide-y things that partially cover the unused outlets.
This extension cord is simple, inexpensive, and appears to be of a nice quality. I especially like the flat plug and the flat cord which makes for simple sliding under the floor boards for a somewhat neater appearance. It works, simple as that.