Buying Sennheiser PC360 headset, Fiio E9 worth it?

As topic title says, I will be purchasing a pair of PC360's fairly soon. I was wondering if the Fiio E9 desktop amp will make any difference on this headset.

I already have a soundcard (Omega Claro Plus), and I also have a Fiio E11 for use on the go.

Is the E9 in my case worth it?

Thanks.