Pros: Great sound!
Cons: Crackling in inputs to headphones and physically too big.
The sound from my iPod Classic via The Total Airhead into my Shure SR440 headphones are truly great, and with four AAA-batteries it's an acceptable playing time too. The only problem I have experienced is contact problems both into the amplifier from the player and from the amplifier to the headphones. Apart from that I have no problems to reccomend this product to anyone with more than average interest of music.