I have one and have found it useful. I'm still getting the hang of swimming and there's so much to think about, catch, kick, head down, elbows high, etc. I've found that I tend to not think of anything but breathing if I'm not using a snorkel. Using the snorkel frees up my mind to focus on something else for a lap or two. I only use the snorkel for less than 1/4 of my pool time but it does help.