My old machine is a Phillips Resperonics System One Remstar Auto 560P. I've been using the Resmed Vauto for about 10 months now.
I still use the Phillips for camping and when I do it takes a while to get used to. I bought a bilevel machine this time around because I found with the old machine, the pressure was excessive and laborious to breathe against.
Some folks here helped me get the pressures set the same as my old machine to start with. Ten months later and they are still set the same. I haven't even felt the need to take full advantage of the bilevel feature. The old machine was set at max pressure relief on exhale. We set the new machine pretty close to the same as the old. I can say now that the Resmed is so smooth and easy. Now when I turn the machine on I have to lift the cushion off my face to see if it is on and blowing air. It always is.

