I prefer the single box solution that the EX5 offers (I used the D50s/A50s/P50 stack on my desk previously)...
- Single integrated PSU. Only one power cable and no power bricks or wall warts.
- No interconnect cables required (which can require a significant amount of space behind the stack).
- One set of controls/remote.
- I don't have to keep lining the Amp up with the DAC because it moved when I unplugged my headphones! (I tried various ways of sticking them together, none of them work very well or for long)
- Integrated pre-amp functionality with independent volume memory. I don't have to unplug headphones to activate pre-out.