Originally Posted by Marvin the Martian
The E6 is a solid deal. I only use mine on the flat EQ setting, and unlike the E11, you can use it and charge it at the same time.
Then again, the E11 has much more power, and its selectable bass boost doesn't muffle everything else when used. I got mine with an extra battery and external charger at no extra cost, and it's more often than not the one I grab(since I mostly amp at home with the big headphones).
I might have bought the E11 if it charged and played at the same time.
The E6 does well with my 150 ohm headphones, but seems underpowered with my 300 ohm headphones.