Has anyone used YieldBuild for Adsense

Yield Buildhttp://yieldbuild.com/ is Adsense Ads optimization program like PubMatic http://pubmatic.com.

I used to have very low rates for my clicks earlier, Pubmatic seems to be pretty good and the returns are really good.

I wanted to see how YieldBuild fares. Has anyone had successful experience with YieldBuild?

 

I don't use such programs. I prefer to optimize my ads manually and it works the best.