I've never used one. But have seen video on the use of one. It is NOT a fad as it has been around for a couple millenia. It does work. Otherwise, it wouldn't have survived as long as it has. Yes, Scarlett, you will get a similar result with a towel and vaporizer. Whether that result will be equally effective, I won't claim.
Something else to consider about sinus problems. Cut as much wheat product out of your diet as possible. It is theorized the gluten in wheat promotes the production of mucuus. I know that the more bread I eat the stuffier my sinuses get.
The secret to longevity is to eat a live frog first thing each day. Then nothing worse will happen to either of you all day.
M.Twain