Knowing more would help
The appliance appears to be working. I have only used it for a half a dozen times. My wife says it hasn't failed yet. I would have appreciated knowing beforehand just what adapting would be necessary from the user. It was a little unnerving to wake up with a pronounced "under-bite" that requires the jaw have a few hours to readjust. Because I had no pain I figured that it's just something the jaw muscles must get used to. It is less and less of a hassle to wear at night and I'm "getting used to" having the under-bite for a few hours each morning. It will be worth it if it continues to work and allow us to share a bed again.