I can't vouch for a comparison here in the U.S. since I've never utilized one. I'm certain they are all as useless as a condom in a convent, no matter the country.
While I'm not familiar with Samaritans here, judging from the name (assuming it's based upon the good Samaritan from scripture) they are probably religious, which means if they did give feedback of any kind, it'd boil down to "Jesus Jesus Jesus," and "God brought you into this world and it's a sin to kill yourself." Steaming piles of bullshit like that.
I laughed my ass off at the reply below that said they wanted him to call back in 24 hours. Seriously?!? They don't even PRETEND to give a shit. Just can't be arsed I guess....
Yes it's true in the U.S. one can technically be committed involuntarily for 72 hours for observation, generally by a doctor or police officer. It's known as the Baker Act (whoever this Baker is, I hope he gets cancer, the fascist scumbag). This is very, VERY rarely used however, as if they don't dot their "i's" and cross their "t's" and use care they can potentially be sued. The period of observation is carried out in the local maniac farm where the person may be drugged and probably raped/molested by the other patients or orderlies. Our "healthcare" system is a hot mess, you see, and it's never going to be fixed.
Compounding the problem is the inherent futility of committing a suicidal person; you can cut their fingernails, isolate them, keep sharp objects away, force feed them, whatever you wish, but where there's a will, there's a way. Ultimately if they want to die enough, they damn sure will.