Using this as primarily a backup for wireless IEMs, and occasional home recording situations. Build quality is extremely solid, which make it a little on the heavy side for a belt pack. The headphone output level is not the loudest, but is comfortable using either closed back, or in-ears. Quality is pretty good, fairly clean and transparent right to the max setting. The mono setting is great, turning the balance knob into a 'more me' control.
The biggest let down is the battery hatch. Flimsy plastic lid covering the PP3 cavity which is constantly prone to coming off. Easily remedied with good ol' gaffer tape, but this should not have to be done.