I'm a huge fan of the Allo Boss Dac. I like his musicality. Pace, rhythm and timing are top. I have tried different power supplies, LPS,Ifi etc. I became best results with two supplies. Pi and Boss separate powered. Now I use a Allo Shanti and it's the best i tried until now. The music becomes more natural, less grainy, less sharpness. And this without loosing his musicality. I detected only benefits and no disadvantage.
One power supply and you are done. Imho a must have, if you like the Boss dac.