Yep. Been there, done that.
For 6 years I had a brick S7 Lightweight (which, ironically, was quite heavy). Then I stupidly accepted the brick S9 Escape because I had done zero research into what advances had been made and what was now available. I saved up for a long time and got the Autoset in November from SecondWind. I had to buy out of pocket because my DME screwed me in more ways that one and didn't even offer me coffee in the morning.
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I am still using the RemStar brick.
Maybe not the best / most comfortable way to go but it's all I have right now.
The pressure gets set by ODI or oxygen desaturation index derived from SO2 Assistant software and wearable logging pulse oximeter.
My muscles have acclimated to breathing against the pressure now so its not so bad once everything is dialed in right.
(no leaking mask issues, getting the minimum pressure right etc. etc)
To took a while though of using all my best human lab-rat techniques.
I even noted an odd effect of what looks like a 'post-titration collapse' of the air way.
I would bump the pressure up by 0.5 to 1.0cm and everything would look good for a few nights but then the apneas would start to fade back in again.
So I was going: What the hell? No one told me about this effect!
I upped the pressure again another 1.0cm. Everything improves again.
I was sure at this point there were no centrals otherwise there would have been no improvement or perhaps ODI would get worse.
After another 2-3 nights, the apneas would be back but less severe.
I went through 12cm and my sinuses & chest muscles were hurting from the pressure and ear popping was getting rough.. Erg..
I stayed at 13cm a while and built up a tolerance but still getting some nasty drops in desats but nothing real threatening.
Then on I went up through 14cm, 15cm and finally got stable at 15.8cm (measured with manometer while holding my breath) at this pressure when I exhale it pressure peaks out well over 17cm.
It's still a bit rough when I first put it all on at bed time but after about 15-20 minutes I re-adapt and finally get a decent night's sleep.
Crude but effective.
I don't know how folks made it through the old vacuum cleaner days. That must have been a really bad time...
Good news is that I won't sleep without it now but soon as I can swing getting an APAP I will be sure to grab one.