does it make them sound any better?

a ipad,ipod,smartphone or computer

will a amp like the fiio e6 improve the sound of my ath m 50's?if so is it worth it? if not is there a different portable amp under 50$ that will?   also i am looking at these for a desktop amp, will it help the m 50's? Wich one is better?  ...

I am looking at a portable amp to drive my m 50's any recommendations? im looking at the e6 right now. also could somebody  give me there opinion on this non portable amp. thank every one :)