vent diffuses somewhat even at 20 cm pressure
leaks held in check well
Simple, well thought out design
Only have to change cushion size to change mask size
Few parts makes cleaning easier
A little picky at times getting adjusted to minimize leaks
I purchased the Simplus in the medium size. I tried it and felt like it was pushing my lower jaw down too much so I quit using it and ordered a small set of cushions. When I got the small cushion, I immediately tried the Simplus again. After a few nights I was unhappy with the fact that I had to fiddle with the mask too much to keep the leaks down . The leaks that I was experiencing were small high velocity leaks into my eyes which bother me a lot. Other tthan the excessive fiddling, I liked the mask.
I went back to my Mirage Quattro for less fiddling. Later I decided to give the Simplus another try after working with it for about a week I found that I had fewer leak events with the medium than the small. Remembering a comment by a forum member that they had a lot better luch with leakage with a replacement cushion, I ordered a brand new medium cushion. When I received the new cushion I immediately tried it out.
My normal process for donning the Simplus is to put the mask on and get all of the straps connected with the hose already connected. Then I wiggle the mask back and forth with the straps to ensure that it is centered. I turn the VPAP on and then pull the mask away from my face to ensure full inflation of the seals.
With the brand new medium cushion, I donned the mask using my normal process and laid down and went to sleep. When I woke up for my normal bathroom break at around 4:00 AM, I took my mask off and, when I returned, I used the same process aand went to sleep.
In the morning I layed around in bed awake for a while, changing position a number of times with no leakage occurring. I was blown away. I did not have to futz with the mask at all. I have used the mask for the last 4 nights. Minimal futzing the whole time. I am now very happy with the Simplus. It feels a little more comfortable than my Mirage Quattro and does not leak at 20 cm/H2O pressure.