ZQuiet is a soft and and flexible anti snoring mouthpiece that allows your mouth to move naturally. Unlike many snoring mouthpieces, ZQuiet allows you to breathe freely through your mouth.
As far as snoring mouthpieces go, the ZQuiet seems to be the most comfortable. However it is still a mouthpiece so many people find them annoying to wear at night. I prefer either pillows or jaw supporters over mouthpieces as I get better nights sleep without having to suck on a mouthpiece all night long.
On their website, they say they typically last “for many months of nightly use.” For $69.90 plus shipping, I’d hope it would last at least a year. This could add up if you need to replace them every year or less.