Is the only difference between these machines the software that they are installed with?
One would think that if an individual starts off with an AirSense, for example, and then it is determined an ASV is needed (or AutoSet for Her, or ...), that the provider/doctor could simply request the device just be software updated accordingly.
The savings to the individual and insurance companies I think would be obvious. (The manufacturer however may not like that.)
A random curiosity ...