Dubstep Girl has posted a review of the Cypher Labs Sustain84 headphone amplifier ($1200) at Headphone Guru. His conclusions:
“Overall, the Sustain84 is priced just right and the perfect amplifier for those looking for a bedside rig or office amp. The sweet, seductive midrange and smooth treble allow it to easily pair with a wide-range of headphones and its ability to drive IEMs without any noise make it that much more versatile. This amp rocks.”
You can read the full review here.