We recently switched from a ResMed S9 BiPAP to the Trilogy 100. For night sleeping, there is little difference (though we did prefer the heated hose and internal humidifier of the ResMed). During the day, however, being able to use the Trilogy on its battery for a couple of hours a day (we take it to work with us), makes it convenient to use. She's now using it about 2 hours in the afternoon while working (she watches Netflix) or while taking a break (she can now lean back and nap). She has found this to be a real bonus. It also has a "Sip & Puff" feature (not currently being used) that the ResMed did not have. When we went to the hospital for Darcey's PEG insertion, the Trilogy (operating on its 6 hour batteries) went in with her. Hope your PALS find it to be the help that we have...
Jim