Twister6 posted a review of the Cyin N3 digital audio player on Head-Fi. From the review it sounds like a great DAP and for just under $150 the price is right. Also, it directly supports ISO and it BT capable.
Hisoundfi has a fine review of the i5 DAP on Head-Fi.
Pros: Musical and engaging sound signature, Drives most high impedance headphones well, Analog to digital volume pot is awesome, Can stream music apps
Cons: Video playback lags and freezes, Some minor software bugs, A little too powerful for sensitive IEMs, Slow charging times
PinkyPowers posted a review of the Cayin i5 DAP over on Head-Fi.
Pros: Outstanding value for such a package. Soothing, robust sound. Gorgeous, high-quality build. Leather case.
Cons: One microSD slot. Unfinished firmware. A few bugs.
Nmatheis posted a review of the Cayin N5 Head-Fi and calls it the lovechild of Cayin’s C5 & N6. Overall it sounds like th Cayin N5 is comperable to its competition in its market space of ~$350.
Review of the Cayin C5DAC. Included are comparisons with the Geek Out GO720 and the Cozoy Astrapi.