Check it out like I mentioned, if you like what you hear, then you like what you hear. I'm not saying anything bad about dac in the MBP, but like I mentioned for $99.00U.S. the Modi definitely sounds better to me. So for a bit more than $200.00U.S., you can purchase both the LD1+ and the Schiit Modi.
BTW, you will not be listening to analog through the headphone out. The optical out is beyond the headphone out.