mic does not appear to work
Ok, had not thought to test that, so I grabbed them again and, the microphone does not appear to work, at least not with Evernote and Swiftkey voice entry mode, the only two apps I tested. That, of course, makes my next point moot.
Any three button headset built for the iPhone would pretty much have to work on the same principles as the original iPhone three button set, but it does not follow that the microphone would have to be located at the same place, or the cords be the same length, or the buttons have the same layout, etc. So, I have not idea where the microphone will be, or whether you'd need to clip it to your shirt. The Apple headset I have hangs about mid chin on me, just a tad below mouth level.