Took the OP’s challenge. Ordered a 16.97 device which arrived on 3/15.I’ve also been working with 10 HFT’s for a few weeks. They are amazing and worth every penny. As some Brits would say, I'm gobsmacked by the HFT's.
Over the last 3 days, I have tried the SG in 4 different locations and the results have been exactly the same. An intense pressure right between my eyes coupled with general anxiety and tension. Just the opposite of relaxation. The effect goes away as soon as the device is turned off. Regarding sound, there is absolutely no change that I can hear. I have considered that my physical discomfort may be affecting how I hear but I would think if that were the case, things would sound worse, not exactly the same.
Ordered some PHT today. Can’t wait to try those.