I've had my ResMed S9 AutoSet for several months now, and I'm completely happy with it. In my opinion, unless you're going to go with a very sophisticated auto-BiPAP, the S9 Autoset is as close as it gets to perfection in the CPAP world.
Auto CPAPs aren't cheap, and I paid about $850 or so for mine several months ago. But, I feel this was a worthwhile investment in my own health.
Some good things about this machine are it's intuitive design - it's very easy to operate, and a couple of minutes in the instruction manual will get you up and running right away. Ease of use - that's important to me and many other CPAP users. The machine itself is very lightweight and small. Additionally, this machine is VERY VERY QUIET. In fact, when your mask is on, someone else in the bedroom will not even know if the machine is on or not. It's amazing to me how much they've reduced the sound levels of this thing.
The S9 Mask-Fit system runs a 3 minute seal integrity test, prior to therapy treatment. After 3 minutes, a Mask-Fit icon appears (a green or red smiley face). If the smiley face is red, adjustments are necessary until the smiley face turns green, then therapy will begin. Cute, and a nice feature, but not completely necessary.
The S9 units offer the optional Humidaire H5i Heated Humidifier with Climate Control. Since I don't use a humidifier, I can't really offer much here, other than to say many people seem to be satisfied with it. Using the optional ClimateLine heated hose is another option which many have found useful. There have been a few problems with early versions of the ClimateLine hose, but I believe ResMed has addressed these issues in their current run of ClimateLine hoses.
The S9 AutoSet comes with a SlimLine (non-heated) hose in the box. The ends of the hose are the same size as standard CPAP tubing, but the hose itself is slightly smaller in diameter. Good for folks who don't like bulky hoses. You can use the supplied SlimLine hose, or use a standard CPAP hose, no problem, the ends are identical, it's just the hose diameter in between that's different. Just remember there is a setting in the setup menu for type of hose, so you'll need to set that in order to maintain proper pressures.
You can use nasal pillows, full face masks or nasal masks with the S9, you'll simply need to set the type of mask in the machine setup menu system.
This machine comes with ResMed's "EPR" (Expiratory Pressure Relief) technology, which is a comfort feature that will decrease the pressure at the beginning of each breath and keeps the pressure low throughout exhalation.
I strongly suggest that most CPAP users should consider going with an auto-CPAP machine. You can read about the benefits of auto-CPAP HERE
The real power behind this little gem is the fact that it's fully data-capable and you can use the optional (and free) ResScan personal computer software to extract data and generate charts to monitor and adjust your ongoing CPAP therapy. You can read about how to get the ResScan software for free HERE
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You just have to purchase a cheap SD Memory Card Reader for your computer (usually between $15-25) and you can then take the SD card out of the CPAP machine and download the data onto your PC for further analysis. An SD card is included with the machine. ResScan is wonderful - I suggest you use it if you get the S9.
If you want to learn more about the S9, there's a good video review at the bottom of this page:
That page also shows you how to enter the Clinician Setup Mode on your S9 unit, to change pressures and other settings you may find useful. If you do choose to change your prescribed pressures, make sure you read through this page
and this page
so you can do it safely and properly.
I really can't think of a lot of negatives for this machine. The only problem I've ever had in the past several months was that two times, the machine just shut off in the middle of the night, waking me up. Not a big deal, especially since it's been operating flawlessly at all other times... and the machine simply came back on after a few seconds and I was able to go right back to sleep. But this problem may have been caused by my sleeping behavior, not necessarily because of a machine malfunction.
I can firmly recommend the ResMed S9 AutoSet CPAP machine, and happily give it "5 stars".