I just received my Dragonfly today! Works great.
I actually plan on using this while at school on my Macbook Pro. So I know the interface is different. But I'm testing it out on my Windows 7 PC now, and I'm not 100% sure if I'm doing it right. For controlling the volume, do I use my sound control panel to do the volume?
I set it up so I have the Dragonfly as the default, even disabled my regular speakers. I followed the instructions, so I know it works (that and, I actually get sound from it lol). Maybe my hearing is just bad, but I have my iTunes volume on full blast + the system volume on full blast, and it's pretty loud - but not just a smidge lower then I want. That said, I'm also using the HD-650's. So maybe that's why.
Thought I would just post on here, to make sure that didn't seem wrong.