alt Hacker NewsThey are a pain in the arse to set up properly and you really need a (edit: very patient, thank you for putting up with all my sine tones, Tommy) deaf person with a suitable hearing aid to help you set it up. If the loop is the wrong length and has the wrong impedance you'll never get the amp balanced up properly, and you can't just take the installer's word for it.
Beyond that I have very little experience of them.
FWIW, it is also possible to get standalone induction receivers that you can plug headphones into, which can be useful for "is this working" checks (for example https://www.ampetronic.com/products/ilr3-audio-induction-loo...). However you really need someone with hearing aids to tell if it's useful or not.
I visit the theatre a lot: ~50 West End visits in 2025, plus several regional venues. It's amazing how many times I've had to abandon the hearing assistance system because it doesn't work well... too quiet, distorted, delayed, poor balance between voices and instruments. Sometimes it just isn't functional at all, and nobody's noticed.
While I'm on the subject: saying "it's a loud show, you'll be able to hear fine" is a bit like telling someone who's short-sighted but has no glasses that "it's a bright show, you'll be able to see". It's not just about volume, but clarity and understanding.