I am in the middle renewing my system. I recently got a McIntosh D150, well, by an accident. With only two hours of play time from brand new equipped with a temporary printer cable and an Oyaide Tsunami power cord that is straight into wall, it sounds pretty good from the HP out. The biggest surprise is it drives IEM with absolute zero back ground noise or hum. My Shure SE846 kills my HD800 in SQ with D150 except and soundstage size with this DAC. I don't have any other HP at monument to test it out. The HD800 with Draug cable sound really boring with D150, it did better with my iSDS Micro but also sharp in HF. D150 HP out sound warmer than Micro iSDS, but little cooler than ALO CDM with stock tubes. Things that Micro iDSD did better than both were the excitement, bass attack, and soundstage 2D shape (feels more natural but not 3 dimensional), Maybe I am just too picky. On the other hand, other music qualities D150 and CDM bettered the Micro by miles, of course at a price. Micro just sound too on cold side for my taste. The bass of CDM is its weakest quality with stock tubes, too rounded, and not layered enough. But I only logged about 80 hours on the CDM so far, I will see if it gets better. D150 offers warm, detailed, and natural sound signature with very exciting bass. There is some mid bass bump (I would not call it a hump) to warm things up. It almost feel it got tube somewhere is the circuit. String instruments like guitar and cello are the D150's specialty. D150 does sound nice but I am not sure it sound $3000 nice though IMHO.
PS: I have not test the DAC alone yet

some pictures