I was very happy with the improvement in hearing, going from a single Phonak Naida Q90 RIC to dual Marvels. (My biggest hearing problem is a severe conductive hearing loss in my right ear. The problem with my left ear is much less severe, but having two HAs helped in noisy environments.) I had a Com Pilot, but I never used it. I just always used my phone with my left ear. I purchased the Marvels equally for hearing and for connectivity.
Before I returned the Marvels, I got a pair of Opn 1s. They aren’t perfect, but they support multi-pairing and to a degree, they are simultaneously connected to multiple paired devices. In my opinion, the Opn connectivity is so much better than the Marvels, it isn’t a fair competition. I have them paired with a laptop, an iphone and an android phone. When they are connected to my laptop, I can monitor the battery condition and adjust the volume using either of my phones. Additionally, probably due to MFI, even while they are connected to my laptop or android phone, I can take a call on the iphone, so they support dual simultaneous streaming connections (one of which must be MFI). (The TV connector is the same.) The drawback is that the connect clip serves as the microphone. (Streaming out is also through the connect clip for the laptop and android.) Some people are making a big deal of this because it’s not “direct streaming”, but all of my colleagues tell me the sound from me is much better using the connect clip (positioned in front of me) than it was from the Marvels. The other improvement is that on the phone, the sound comes to both ears, unlike the Marvels. I’m hoping Oticon will extend the connectivity so they can be simultaneously connected to all paired devices, not only for volume adjustments but also for streaming. Switching the connect clip from one device to another is done by turning on BT on the device you want it to connect with and turning it off on the other devices. It connects to whatever device is on. (If multiple devices are on, it will connect with whichever one has the strongest signal at the time. It will stay connected with that device until you turn off BT.) Definitely easier than un-pairing and re-pairing and it takes literally a few seconds to switch.
I have no idea why Phonak released the Marvels with single pairing or whether they will fix it. Presumably they know but they aren’t talking. The Marvels and the Opns sound somewhat different, but to be honest, I would not be able to tell which was which. I would have been happy with either the Marvels or the Opns, but the connectivity is what made the decision for me.