my experience:
called one, when my event first happened. i was having a panic attack and i supposed it helped in a way because i automatically switched to being able to present and communicate wiht the other person on the line. sort of like i felt bad for being a burden to them so i was polite. I asked them to help me organize my thoughts because i had so many of them swirling in my head it felt sort of like the idea of evil/casuality from beserk but much more sharp and loud and faster? regardless i basically used him as a RAM or a notepad to organize my thoughts i would tell him my thoughts and ask him to remind me because i was so close to completing a thought but always got cut off by another one before i could complete it, this happened for like a hour before i called and i felt like i was about to permanently damage my brain/lose grip on reality
anyways he was nice but for me personally the approach was too clinical i guess, his advice felt too generic and cliche and seethrough but i guess those problems are a reflection of my own biases against mental health in general a view i had a priviliged neurotypical before the event. it did get better when i asked him to tell me about himself but i felt bad about it because i felt like i was forcing him to do it because he wouldnt want to be rude to someone suicidal. He later offered to transfer me to a regional helpline i think he was being professional because he wanted someone to give regional specific legal advice but perhaps because of my state of mind i thought he was disgusted with me and wanted to get rid of me. before that happened though i was talking some more, rambling really. and then i accidentally hit the hangup button because i was physcially tweaking in my bed. I stared at my phone for a couple seconds, i suddenly realized how bright the phone screen was against my eyes in the backdrop of my dark room. and i recalled the last few words of conversation i had, i concluded that it sounded like i hung up the phone suddenly to go through with it and finally find somethign to hang myself off of. I frantically called back the number and conneced with a different operator, i tried my best to remember any distinct details of the guy before me but i guess the coworkers arent close because the new guy couldnt trasnfer me. He did offer to send a message to him basically saying "hey man its the guy from earlier i accidentally hung up and from your poitn of view it must of seemed like i made a snap decision to go through with something, i just wanted you to know that im not, and you were really helpful" but i think the new guy was just saying that to make me feel better.
In the end i thanked them and ended the call and started crying because it didnt help, the washing machine of my brain started again and i kept thinking about how my existence and every action i do just makes things worse and that i should just kill myself and stop the ripple effect of my existence from casuing more suffering of everyone else. I thought about maybe that the original operator was like me and didnt believe, and that he thought i was actually going to kill myself and that that was going to be his last straw and he was going to kill himself and i would be atleast partly responsible for contributing to the secondary trauma that was being a suicide hotline operator.
so yeah. it depends, he did his best and i used to be a reasonable well adjusted mentally healthy person but because of the event i think i was just unconsolable no matter what.