I was prescribed a SomnoGuard mandibular advancement device (MAD) several years ago by my ENT. I used one for about 3 years. My Medicare Advantage plan paid a good bit on this, until I changed plans and the ENT for some reason would only sell me a noncovered device for full retail ($700+). I looked online for an alternative. My research lead me several different devices. The SnoreRX seemed to be the closest alternative in structure and operation to the SomnoGuard so I decided to try it. Much less expensive, thankfully, as I am not getting any insurance coverage. The SnoreRX seems to work pretty well. Because I already knew about MAD operation and had used the SomnoGuard, I adapted quickly to the SnoreRX. It seems to work just about as well. I note the following differences: (1) the tooth impressions are not as deep as the SomnoGuard, so the SnoreRX does not hold as firmly to the teeth; (2) there is something about the hinge at the back that irritates my gum on one side, I think the hinge has a protrusion that rubs or catches some of my gum; I do not know if I will adapt to this; (3) the SomnoGuard allows for more lateral movement of the jaw, which the SnoreRX does not; it helps to have a bit more lateral movement: (4) the adjustment feature is a little tricky, but not too bad, I had to fiddle with it. But overall, I intend to keep with the SnoreRX as long as it remains affordable … I hope they can make some minor improvements as suggested.