I've had this DAC for a few months now and I think its pretty much broken in.  At first the sound is very open with a huge sound stage and a tad bit edgy but over time the edginess goes away completely, the soundstage settles in nicely and it becomes very smooth sounding.  This is a very analog sounding DAC with great looks, great variety of inputs and outputs top notch build quality.  Its a keeper.