I have the ENZO 2 9 and it works great with the iPhone 6s! I love not having to have a neck worn streamer any more!!
I switched to the ENZO2 from a Siemens Aquaris. The ENZO2 sounds much better to me, but does get more wind noise then the Aquaris. I think this is due to the Aquaris' microphones being covered due to the water proofing. I fixed the wind issue by putting some EarGear on my ENZO2s.
Being able to quickly adjust the ENZO2 from the phone app is really nice. The watch app isn't that great though, it is slow to respond and is missing some features of the phone app.
If you have issues hearing remote speakers (meetings, restaurants, cars, etc...), I highly recommend getting the MultiMic too. The MultiMic is a remote microphone and streamer that send the sound right to the ENZO2. You can remotely adjust the volume between the MultiMic and your hearing aids through the phone app.