Its interface is vey well divided into different groups, divided again in different sections.
You will access options to change settings concerning management, personaliation and customization. That means you will be able to personalize your system and make it run better.
It offers a lot of possible modifications, so you will be able to make Windows 7 run better and make it suit your needs.
In short, if you want to take the most out of Windows 7, GIGATweaker can be very helpful.