I have just replaced my Unitron Moxi Pro aids - now 5 years old - with Phonak Marvel M 90 rechargeables and the TV transmitter - the improvments in speech clarity in noisy backgrounds and in the car is impressive. TV sound quality is also superb and the bluetooth connects easily. Using the direct bluetooth connection with my mobile is also a great feature.
With my previous aids I had the Unitron uDirect 2 neck dongle, the uTV2 and the uMic (mainly used in the car so I could converse with my wife) and none of them are compatible with the Marvels. Whether the later uTV3 will connect I have no idea.
I bought a Avantree Priva 3 Dual Link low latency wireless transmitter to enable me to stream audio from my computer. Although it theoretically had the compatible bluetooth version it would not connect to my aids and I sent it back.
I am not optimistic there is yet an alternative sender to the Phonak one, which in the UK costs about £150. I didn’t pay separately for mine - it was bundled with the cost of the aids at £2,950.