Summary: I plug the DragonFly directly into my laptop, and I have a pair of entry level audiophile headphones that I use with it. They don't require a lot of power, so I'm not sure about using an amp. I use JRiver MC for playback. I'm satisfied.
Summary: I have tried the device several times, from a MacBook Pro and from a Windows desktop computer. I've tested it with AAC and MP3 files and with CD's. I "think" I can hear a difference at times, but it is hard to put my finger on it. I will say that it feels more pleasant to listen using the Dragonfly.
Pros: Overall I would say that I "think" the Dragonfly adds fidelity, cleanness, and listening comfort.
Cons: I'm still having trouble saying that I can hear a "definite" difference with the Dragonfly. The improvement seems pretty subtle.
Summary: I have this DAC plugged into a Dell Precision M4600 Laptop, i7 CPU with 8GB of RAM running Windows 7 SP1 64-bit. I'm using a 3.5mm headphone plug to RCA 'Y' adapter connected to an Adcom GFA-535 II, 2-channel amplifier driving a pair of Pioneer SP-BS22-LR bookshelf speakers.
Pros: Improved the stereo image of my speakers. They used to sound like two separate speakers with not much of a sound stage. Now when I listen to vocalists, the voices come from a point centered between the speakers. Its only $150.00!!!!!!!!!!!!!!!
Cons: Be careful pairing this with Audioquest adapter cables if you are using an outboard amplifier. The interconnects have RCA terminals which only have a span of about 3 inches. The L and R jacks on my amp are about 12" apart. I contacted Audioquest and was told that they do not have an interconnect ...