Does "Stuffit" worth it?

Hi guys! I really trust the guys on this forum and thanks in advance for always helping! I'm still a beginner in the mac world so please help.

I have a problem with compressed files on my macbook pro version 10.8.2. My mac doesn't open some compressed files and when I surfed online some people were recommending this app: "stuffit". Just want to know if it worths it?

It is gonna help me open all the compressed file? :) Thanks in advance.