I chose Pure Sleep boil-and-bite a year ago because it was the cheapest solution to a discovered moderate sleep apnea condition due to obstructions in the throat from a dropping or backwards-shifting jaw. This product better than cut in half the number of breathing obstructions during sleep based upon results from a post-home sleep study. I do feel more refreshed after sleeping and my watch (Fitbit) monitor sleep scores have gone up, including O2 measurements. It has held up fairly well. I do anticipate that it will not last for a long period and will need to be replaced with a new one at some point. However, after a year, it is still working like new. I clean it with my Philips Sonic electric toothbrush daily. The only issue that I have had is that I may have too aggressively aligned my jaw forward in the "bite" process. About once a month, my jaw "muscles" are sore in the morning for about an hour. I may have been trying to grind my teeth during sleep. However, being a little sore is better than actually grinding my teeth. I do highly recommend the product.