A friend recommended VitalSleep on a fishing trip and i ordered online immediately. My device was waiting for me when I got home, I molded it to fit and popped it in that first night. Instant success! My wife spent he entire night in our bedroom and said that i didn't snore at all, for the first time in years.
For me, I didn't need to make any adjustments with the included allen wrench, I've been using it every night at the original setting. It looks like it could be bulky, but i was surprised at how comfortable it is. I actually like using it.
I will say that my jaw "my bite" feels misaligned in the morning after I remove the device. It's not painful and returns to normal pretty quickly, but i thought it was worth mentioning.