We have one in our church, as all churches in the UK are legally required to have I think (many other venues too). As another commenter said you can get separate receivers, so I got one at one time to help with audio quality for live streaming. The loop signal comes straight out of the church PA, so from all the microphones and so the audio quality was very good, but there was a lot of hiss. I don't know if that's always the case with induction loops. At one time it stopped working - someone cut one of the connections back to the loop amp - so I was able to test it, which is handy.

We have several people who depend on it, including the church organist, so we soon hear if it's not working. He says it's working really well.

My Grandmother says the one in her church (which is nearby) doesn't work well at all and she usually doesn't hear much. I'm not sure why. She also finds the one in our church good, so I think they must have some problem.

I would think it could be worth contacting someone in charge of the venue(s) if it's somewhere you go regularly. I would imagine it heavily depends on how the whole thing is set up though - quality of microphones etc. We have lectern mics, singer mic, lapel mics for priest and a wide field mic. on the altar, so pretty good coverage, and they all go into an auto switcher thingy. I think it would need to be set up by someone who at least half knows what they're doing.