I bought the Phonak TV streamer before I read here that the Costco TV streamer worked with the Marvels and is only $99. I was still within the return period for the Phonak streamer, so I went to Costco and bought theirs.
Bottom line: They look identical, but the Phonak one has a greater range. I put the Costco streamer in the same location, and it would cut out when I was in the next room - the kitchen - behind the wall separating the two rooms.
The Phonak streamer keeps the connection unless I’m in a room at the end of the house with two walls between me and the streamer. I can go outside to potty the dogs, and it doesn’t lose the connection unless I’m more than 10 feet from the house.
I decided to keep the Phonak streamer for the TV, and the Costco streamer for my computer.