I recently got hearing aids, and my old Sidekick II made an odd buzz and hiccup noise ad nauseum every time I used it with the hearing aids. I had checked on fixes for the hearing aid/cell phone mismatch problems and others said that most of the bluetooth headsets eliminated the problem. The new Sidekick 3 has bluetooth and the old one didn't. So, I splurged and bought this bluetooth headset.For anybody out there that's having the same problem, I bought this headset to use with my Sidekick 3 and completely eliminated the problem. The aids I have are by Siemens, and I don't know the model number, but they fit in the ear cannal and extend outside my ear a tiny bit further than my actual outer ear. The headset hook bends a bit when I wear it over the aid, and my ear bends a bit, too. I suspect that this would not be comfortable to wear all day, but for a few hours, it fits well and feels secure, and doesn't slide around. It's much more comfortable without the aid. I suspect that it might not work well with behind-the-ear aids, but I don't wear one and can't try it out, so I couldn't say.My hearing problem is mainly on the high end, and this headset works well without the hearing aids, too.Others have commented that this headset doesn't reproduce the low tones as well as they might like. From my discussions with the people who fitted my aids, I discovered that eliminating or lessening the lower tones from human speech tends to make the speech more understandable. Most of the sounds that contain meaning are in the higher end of the human speech range. So, for those of you who don't have a hearing problem, this MIGHT (I can't judge, because my hearing is not normal) not sound as good, but it should be more understandable and clearer than a headset that also includes the lower tones.For others with hearing aid/bluetooth headset questions, I suggest finding someone who has a headset that looks like it might work and asking if you can try it.