I had the Headstreamer and thought it was great as a DAC warm with good punch. At $139 it's a great deal. The amp in it was decent too however only with efficient Phones. I didn't feel like they drove my DT 770's very well. If it would have had a volume control on it and a bit more power, I'd probably still have it.
Plus the DAC is Asynchronous and according to HRT, amping it was ok (in the sense of synergy).
I'm currently using the HD25's and the HRT would have driven them just fine. I may revisit this DAC in the future it worked great with my Note 2.
By the way the customer service at HRT was excellent when I called.
Edited by Dark Helmet - 3/28/13 at 2:52pm