I’ve been using Signia’s for the past 5 years or so and they’re a game changer. Absolute necessity in the office, and when I take them off for the day, it feels like jabbing a pair of cotton balls in my noggin. Love their flexibility and sound quality, but haven’t experienced the "phone ringing" that @wlutke mentioned. I’ve got very mild tinnitus and mild high frequency hearing loss, which are probably related, so what I lose while listening to music is the air and ambience. Your application may be different which will affect your use case.
I now wear them all the time to the symphony and theater performances. Even have worn them to amplified concerts without any problem (the aids automatically compensate for loud noises). But the purist in me (coupled with just my mild hearing loss) takes them off while listening to two-channel in the media room - I just turn it up. The day of reckoning will come for sure as my hearing gets work as I get older: I won’t be able to turn up the volume any more without forcing my family out of the home or pissing off my neighbors. 😏