Is Questbridge worth it?

After doing some research, I am unsure if I should apply through Questbrdge. Regardless, I would have to do the common app since a couple of my choices are not partners with Questbridge. Duke is the only Questbridge partner college that I am heavily interested in.

I was initially going to do ED at Duke before learning about Questbridge. Are my chances going to be higher through this program? Am I better off sticking to the common app?