Chris Devine of Performer Magazine featured the Sound Tap AC in his Gear Reviews guide, in the April/May 2018 print edition.
Here's what he had to say:
Integrating an in-ear setup to an existing PA/monitoring system has been problematic at best, especially on the road, with a venue’s already existing monitors.
Ultimate Ears has a way to make using in-ear monitors feasible, even in small club settings, without the need for complicated wireless transmitters and bodypacks.”
“It’s a fairly big box, with a volume control and gain setting, but ease-of-use is superb.”
“Overall it functions really well, and for performers who don’t move around a lot on stage (drummers, keyboard players), or for rehearsal situations where space and volume are at a premium, this is a great, inexpensive tool for personal monitoring. All in all, it’s a small price to pay to get that direct connection, and using these can make monitoring on-stage a lot easier, meaning a much lower stage volume overall.”