I have had my appliance for four days now and have worn it almost 24/7. My speech at first was terrible because of the bite plate, but it is slowly improving. The expansion screw does not affect my speech at all. I estimate the bite plate to be about 5mm thick.
The appliance is beautifully designed and manufactured and I am very pleased with it. My only complaint was the glacially slow delivery after I had approved the finished appliance.
I have tried to post photos but am met with a response to the effect that the file is too big. So I will have to make do with the high quality phot I received from the shop which I have already posted.