pfblockerng with opendns

[czar666]

Can someone give me a clear answer on this question please :
Is it possible to install pfblockerng and still use opendns? And if yes, is it useful?

I've read this post, but after reading this, it's even more unclear to me.

I read much good about pfblockerng. So it made me curious and I want to try it. Even if I am happy with my current setup (forwarding dns to Opendns).

Current setup:

Thanks for your help.