Finally found one that works!
I've tried every type of snoring device I've seen. The full one-piece mouthguards and the SnoreRx plus (the one that allows you to open your mouth) work but make me feel like someone is trying to pull my front teeth out when I wake up. They also are huge and bulky. The "tongue bubble" devices don't stay in my mouth and the Airwaav Recovery did nothing. The ZQuiet Advance lets me actually breath through my mouth if I wish, doesn't bother my teeth, and overall just works. I don't feel like I have a brick in my mouth and I don't snore. Great device!