I think it does well. I came from a much more expensive Darkvoice 337 and that thing with the 650s was just too warm/dark for me, almost no treble. Well, the treble just opened up to become wonderful when I switched to the Compass, and the soundstage too as the DV337 had dual volume knobs and I could never get them right and felt like I was getting improper imaging. With a good DAC the soundstage is definitely nice and open.
I don't really know much about it though in terms of sonic quality and sound signature as I've only ever heard an E7 (when I had my Beyer DT770s), the Darkvoice 337 and the Compass. The E7 is a portable amp so that's out of the running, and then we have a difference of tube vs. solid state so I feel the difference was too dramatic to say what the SS is of this amp. All I know is I like it, and there's probably a lot better to be had out there though. I guess I could say it gave the 650s the treble boost/sparkle they needed to sound nice and not overly dark (veiled?). Worth the ~$200 I paid for it IMHO
The built in DAC is decent for a starter but I can definitely tell the difference in soundstage etc. vs. my PS Audio DLIII (which is a giant leap ahead at $7-800 new [and 500 used for me], mind you)