Yesterday they loaned me a fixed pressure CPAP RemStar Plus set at 10. My average pressure on the S9 is 6-7 so maybe this is too high? Will try using it after a two day oxymeter test. They then offered me a choice of all their masks. But none were suitable. I use the Resmed Mirage micro(12) with and X large cushion (or else it pivots on the bridge of by broken nose). They had never stocked this size cushion! Forcing patients to either over tighten the large size or use a long static mask, which although comfortable would be a night mare to adjust the straps every time it was removed. They then only had the ancient heavy tubing, They gave me a free sample light weight one with hard ends that they had but this too was totally useless on the lightly fitted cushion mask, The slim line tube I have already is light years ahead of the thick, stiff heavy tubes. Yet here in the UK unless you buy your self you won't get it.
I read with some confusion the lack of information about the type of tubing users are using in their details. The S9 takes into account tube diameter and length in its set up.
It is my belief that for a conscious, un-sedated , user with relatively low pressure it is nearly impossible to achieve 100% usage with out constant leaks or skin sores without the correctly fitted mirage micro or even the ultra nasal mask and a slim line tube!