Just got mine a few days ago. I have listened with iPod (both MP3's and Apple lossless)and laptop as sources (no external DAC). So far, I have only tried them on my desktop.
I'm really enjoying the A2's so far. Easy to listen to, not fatiguing at all to my ears. I listen to a wide range of music- jazz, classical, rock, vocal- and stuff just sounds good on these little guys.
I have to strongly disagree with folks who sometimes write that these speakers are not suitable for music listening. They won't, of course, compete with larger or more expensive systems. But, in my opinion, the A2's are not just a great value. They are musical.... for $199 I think they represent a terrific inexpensive desktop option.
Tonight, I'm going to try them with my widescreen LCD TV just for fun....