Hola ..
Disclaimer :: I did not buy the 'phones, I'm not interested in Bone Phones, I have at least a half dozen classic 'phones laying around, I did not make the Bone Phones nor get any kick-back on any sales ..
A discussion had ensued around this tech, I saw a deal and posted it .. I am simply the Messenger ..
However, if I put my engineer hat on, logic would say, 'The tech in these phones is simply unable to provide anywhere near the same level of gain as traditional headphones .. no way, no how .. and, I would have to venture to guess it would not matter what brand .. '
Now, that's just coming from the standpoint of how hearing works, which I've dealt with for most of my life .. I could be wrong ..
Our friends at Head Phone University tell us this, it does not necessarily agree with my comments ::
Are Bone Conduction Headphones Loud Enough? – Headphone University
No negative feelings toward you AT ALL for posting the deal on the bone phones. Headphone University, Youtube reviews, and @r77's comments must be for better quality bone phones. I can't imagine doing any kind of exercise / workout and being able to hear the volume put out by the 'deal ones' yet alone stay in place due to the fit. Not your fault, now way, now how that I'm disappointed in them. I checked 1st for free returns before I bought them. So all is good, won't cost me a cent to have tried them out.
Like you I've got multiple ear buds and full headsets of good quality. I just tried this on a whim. No harm done.
But I'd still like to hear from others who got them. Might be just me who is disappointed with them.