The device has worked great for me. Build quality of the rack ears seems a little flimsy, and the aerial is sometimes lose when I open my rack, but the sound quality is what you'd expect from UHF. I've had no problems with noise or white noise sweeps etc. Add some bottom-end boost at the desk, and it's totally workable. I play bass on stage and these things only go i think 80hz upwards and so sound a bit thin, so i prefer a little beef added at the desk. My IEMs are not great or moulded though. But I have tried it with beyer headphones as well.
UPDATE: 2024
Unfortunately, I've had to downgrade my review due to the Stereo feature not working. I found a friend with the exact same system, and swapped out each component (source cables, transmitter, receiver, headphones) and came to the conclusion that the summing is broken. A hard panned click does not sound hard panned in the ears, it always bleeds. Everything is set up correctly on the pack such as stereo mode, focus mode being off etc.... Really such a shame. I was sure it was only my transmitter but the test today has confirmed I'm going to have to upgrade. Beware if you're expecting an actual stereo signal.