Superb sound with the PSU. Great dynamics, huge soundstage, balanced detailed highs and a rock solid bottom. Beats the other Dacs I've tested (all sub 600$ though). Could look cooler.. Upgraded mine to SE via ITEM audio in the uk. My guess is the total cost ended up around 500$ including everything.. Well worth it.

Had it in my rig for a few months, might have been unsuccessful in breaking it in properly but after much consideration my Kingrex UD-01 SE with the PSU unit stayed and the Matrix went away. I experimented with using the optical toslink instead of USB but the Kingrex still stood strong, which I didn't expect. Still, a good buy at the 240 something (not quite sure exactly what I paid anymore..).

My brief time with these Grados left me rather cold. I really like my Grado SR80s and hoped to get more of everything with the SR325is but instead I was left with the feeling that they try to bite of a bit more than they can chew. In my opinion they try to be both dynamic, fun lovin Grados and transparent and neutral Sens and basically doesn't succeed in any of these pursuits. Don't get me wrong, they do sound nice and all but at the price, even 2hand, I just wanted a bit more. I'm happy with my Grado SR80s, less sophisticated but at least they know what they are..
 
btw, bought mine 2 hand..