So, this ia a very inexpensive product, and I didn't expect much buying it, but it has proven to be a brilliant additon to my studio setup, so much so that i will get another one!
The main feature for me is the possibility to have two main mixes selectable for each headphone out. There are also direct inputs for each channel on the back, but those are only useable if the main inputs are not used, as there is no blend function.
The build quality and feel of the controls is really nice, especially for the price, and the sound is good enough for recording puropses.
One small drawback (espeiclly if you have drastically diffeent mixes for the two inputs) is that there is a combined input level meter for the two inputs.