1. It extended suffrage to the middle classes who had been rising in wealth and power since the start of the Industrial Revolution
2. The act also aimed to re-evaluate constituent areas, new fast growing cities like Manchester and Liverpool
3. The act can be seen as a way of accepting the middle class into the political arena before the middle and working classes could unite and pose a serious threat to the upper classes in charge of parliament.
This is what I know! Hope this helps :)