Mine sound pretty nice out of an ipod / Pico Slim. They are not a great traveling headphone though. I use them back and forth to work, but don't take them traveling or flying. Just too bulky for that purpose for me. I am going as far as an iBasso D6 for a more powerful amp right now, and the Centrance HIFI-M8 once it ships. That is by choice, though, not necessity.
Still, there are better headphones out there for travel, IMHO. The Beyer DT1350 can be had for a decent price used, as can the Senn HD-25-1-II. Both are excellent, both play great straight out of an iPod.
I agree I use them going to and from classes on campus from my apartment right out of my iphone5. Sound just fine. Granted an o2 or fiio e17 would help, they dont NEEEED it. Both orthos love ampage so I will probably get another portable amp soon.