I find my ConnectClip useful to stream sound from both my work and home computer to my OPN S 1 aids. It also allows a connection from my hearing aids to my work VOIP Cisco phone that has bluetooth. Sound quality is OK but closed wired headphones over my hearing aids provide fuller sound, particularly for lower frequencies. But the headphones do not allow for the bi-directional connection provided by the ConnectClip.
In general it is a useful accessory for me but I do tend to use my iPhone with direct connection to the hearing aids for most phone calls.
Some people with Oticon aids use a TV Adapter 3 to stream sound from computers - it works but only in one direction. The connect clip and hearing aid combination acts as a headset (the mic is in the ConnectClip) so you can use the ConnectClip for two-way audio with a computer where that won’t work with the TV Adapter.
Your dad may/may not need a better Bluetooth adapter than is in his computer as some implementations are apparently buggy and/or incomplete. If that is the case, he might need a Sennheiser BTD 800 USB dongle - my now old ConnectClip came with the BTD 800 and Oticon suggested that I always use it with a desktop computer (and use it with any laptop that had issues).