I have a Lumin T2 with SBooster. I have found the dac inside of it sounds better than the dac2 in the McIntosh. I have read/heard that the dac2 in the McIntosh is on par with a standalone dac in the $1500 range.
My test bed was Lumin into a Ma2700 preamp via AQ earth cables, versus an AQ Diamond coax cable feeding the Dac2 in the Ma2700 from the Lumin T2.
My opinion is that the dac in the Lumin had better imaging.