Pros: sound, power, balance, battery
Cons: interface, capicity
If you are getting one of these, it is probably for the sound and only the sound. I got one at christmas, and have been using for a few hours per day and love the sound.
For comparisons, Houston Symphony is playing the 4 Rachmanioff Piano Concertos over three weeks. I have season tickets, at the same elevation as the piano in the center. (close to the best seats for music in the venue.) I have been listening to a couple of different recordings, and comparison to my Studio. For this set up i have been using Senn 598 when at home or in the office, and a Ety 4S when traveling. I have also done a little comparison with my apple through a nuforce dac and audio engine 5+.
The sound stage is full and realistic. I have to say that the sound stage in a quiet room is like being at the symphony with the music, the visual images are of the performances I just saw. The tonal match and balance is as close to live as I can comprehend for such a small portable rig.
The piano tone, warmth, and clarity are as close to live as i can tell. Just like being there.
The unit interface takes some time. Basic. A little confusing. but works. Basically the unit is great if you are willing to give in on the interface. It is close to the point that I am thinking of selling the unit, and going back to my iPod and DAC combination. The size and battery life suffer greatly, but it does music videos, etc. Since i am carrying the iphone and iPod anyway, i am not sure that the music quality of the studio is warranted, as this is my travel set up. Touch decision, so i will take some more time to think about it.