I bought a set of OPN 1 hearing aids from Buyhear in January and have been streaming music and podcasts to them from my iPhone 6 since then. They have worked quite well for the most part. Pairing them to the iPhone is quick and easy using the hearing aid accessibility feature of the iPhone.
The sound quality is decent but of course there isn’t much bass (really not any), just mid range and treble as you might expect. The bluetooth connection seems to be fairly stable but it does drop out occasionally, usually on just one side. To fix the problem I usually just turn off bluetooth on the iPhone and then turn it back on again and the connection is reestablished.
About a week ago I updated the firmware on my OPN 1 hearing aids from version 2 to version 4 (I have an ExpressLINK device and the Genie 2 software so I can do it myself) and so far I think that the bluetooth connection is more stable and improved. Since the update I have had only one dropout on one side which was quickly fixed by turning bluetooth off and on again.
Another problem that seems to have been fixed (at least so far) since the firmware update is having one of the aids reboot spontaneously. I had that happen occasionally before the update but since then it has not happened once.