It absolutely works. I went from a very small neck to a decently sized one.
NEVER ego lift with these. If something feels even a tiny bit wrong, stop. Lower weight or just leave your neck alone for the rest of the day (should probably drop most compound lifts as well since you WILL activate your upper back or neck).
ALWAYS warm up with a lower weight. Yes, you're young and can get away with not warming up for most lifts. Warm up for these.
Keep rep ranges high and weight low(ish), because, yet again, fuck injuries.

My only oopsies have taken place because I ignored the above advice. Injuries took about a week to heal but also made it hard to even have a head attached to my neck. Very annoying injuries.