I have mild/moderate OSA. For seven months I've been using a Klearway oral appliance, which has a soft filler. I am generally happy with it. However, it has cracked three times. It has to be sent to a lab for repairs. My dentist says Klearway makes one which is totally hard, no soft filler, which would stand up better. I am at a decision point to go that direction or consider another brand. Has anyone else experienced this. My insurance covers up to one appliance per calendar year, up to $1,500