Pros: Sound, Bass Boost, USB Power/Connect, Gain Switch
Cons: No Optical, No 1/4" Jack
For the price of this thing, you definitely can't go wrong. It has a very nice Wolfson WM8741 chip in it and immediately you will find out what you have been missing in your music/gaming. It brings everything to crisp pure life and detail. I found it can even drive some hard to drive headphones like the Beyerdynamic DT series in the 250 Ohm area very well. The bass boost on it is very nice. The only thing I miss is a 1/4" jack and an optical connection. But for the price, you can't go wrong with this thing. You can hook up an external amp to it to get even better power. It has a Low/High gain switch on it as well. Many people say it's better than the E7 and I probably have to agree since it is a newer model. The only bad thing is, it will only work with a computer usb connection which a lot of people, including myself dislike. But for the price I paid, you can't go wrong with it at all, it's very nice.
Regarding the Bithead, the Headroom products and especially in the desktop range do strike me as interesting. But for simple desktop use the E10 is worth the money and I do appreciate the line out...