I use one and its critical that I do. I got used to it out of neccessity,and now Im fairly comfortable with it,except it is hot on my face in the summer.I am overweight,but my dad had severe sleep apnea too,and he weighed 110 pounds soaking wet.So weight may or may not be a factor,it all depends on the individual.Some sleep apnea is caused by "obstruction"(collapse of soft palate issues) ,but there is another type where there is actually a short in the brain that lets you"forget" to breathe for short periods while asleep. You need a study to determine what type you have and what you need.