My mom is being switched from a bipap to Trilogy today. From what I have been reading it sounds like it is for 24 hour use. Right now she only uses the bipap when she is napping during the day or sleeping at night.
I guess I am nervous because this is something new.

I use nasal pillows with a chin strap. I started out with a full face mask and found the pillows the easiest to use. As for marks on your face in the morning, mine are always gone by time I am out of the shower.