Pros: Build quality and lots of input options
Cons: USB input does not support 24-bit/96Khz
I've only had this for a short time but I love it so far. The xfi soundcard on my computer didn't have enough juice to power my HD650s so I got this to use as an amp and DAC. I'm using the optical out from my soundcard instead of USB because the USB on this DAC does not support 24-bit/96Khz (it is resampled in the DAC). This wouldn't be an issue except that I would like to hook my xbox 360 up using the optical connection, now I have to use RCA. The tube didn't change the "warmth" of the sound as much as I expected or would have liked, but probably for the better. This has been a great purchase and I'd recommend it to anyone looking for a good all-in-one solution for a reasonable price.