PS
Headphones for the battery operated devices (pandoras, Bass Trainers, etc.) need to be in the 16 to 30-something-ohm impedance range. Like their IPod and Walkman brethren, you're not talking about a lot of output, so you can 'buy' more output by getting lower-impedance 'phones. Not a problem as more and more better headphones are being built for these devices in these impedance ranges. Typical 50, 60 ohm studio cans will suck the air right out of them. 240 AKG's need not apply !
One reason I also bought the Mackie: The VLZ inputs are virtually impossible to distort even with a slapped bass, and the 1-watt headphone output allowed me to use virtually any headphone out there.
J o e y