As above, I get the impression it's not a bad role at all if you don't mind shift work and can get into it. The pay is good, and as I understand it's a pretty well unionised profession which helps give you a lot of job security and makes sure you don't get messed around on the job otherwise, in theory. However of course, there is a lot of responsibility in the job, so I imagine you need some mental/emotional fortitude to deal with potential stress while on the job. That said, it doesn't seem like the kind of job you "take home with you", so once you clock out you should be able to just switch off from that anyway.
Plus, generally shift based roles (particularly unionised ones) are quite good for being able to reliably leave when you're supposed to, so you're probably less likely to potentially need to stay on after your shift because something happened. However, I've no actual direct experience of the profession, the above is just based on when I looked into it a while back and on my experiences in a shift based, unionised workplace in another sector.