I was running and enjoying my Perfect Wave Tansport into a Wyred 4 Sound DAC 2 SE for several years using the I2S interface. Recently, I found myself downsizing/selling much gear so I tried the Stellar Gain Cell DAC and two M700 monoblocks. With the I2S, digital from the PWT is much improved (depth, dynamics, warmth, musicality) and iTunes streaming from my MacBook Pro is likewise improved. So there's a comparative listening experence for you.