they are seriously uncool
alot of old ballers wear them and look like ... well old ballers
they offer some protection from what ive heard
but in my opinion steer clear and wear a neckerchief if allowed, if not grin and bear it neck shots dont happen to me often (touch wood) but its due to playing properly
my advice save yourself the money and buy a cheap paisley neckerchief or not bother and spend the rest on paint for training