I have a G5. The hardest part for me was getting used to the pulse dose O2. But after a month I got it under control. I fell with it and it was noisier, called them and they replaced it next day. A year later, I had a low air warning and called them, again they replaced it with a new unit. They stand behind their warrantee.
Now they have an improved app that lets you know more info about the oxygen and stats. I use it all the time when I leave the house. I bought both a small and large battery. I have even used it plugged in over night on trips. Yes it has arms but you can turn the volume of them down or even off so nobody gets bothered. I find the no breath detected alarm to be most helpful for me.
All in all I am very satisfied with it.....

I bought an Inogen G5 about 3 1/2 years ago. I’ve had good luck with it. However, it only goes to 5 liters and I will be there soon.

I agree that the user manual is very confusing. Too many symbols and didn't know that some are not for me to service but for the company to service.

I have an Inogen Rove 6, only had since January. I have a smaller one that medicare provided. but wanted one that would last for longer period, &. little quieter for church, etc. It is good for up to 5 hrs at 2 liters, comes with a 2nd battery that goes up to 10 hrs, but I have so far not used 2 batteries Would. be good I guess for trips, but awfully heavy. The Roveis heavier than the RhythmCare provided. by Medicare, even with 1 battery. If not for noise factor I would Prefer the medicare unit, but it took a long time to get it & I was in a fizz to be able to get out without the wheeled tank! Got the Rove in 3 days. I was also impressed with. customer service on several calls, but last time I had question I gave up after on hold for 30 min. I also think the instruction manual is not user friendly, has a jillion alarm symbols, but unless u carried the manual with u, or even if u did, u might die. before u found what was wrong! Doesn’t have a good alphabetical index .
Perhaps I have not used it long enough to give a full review.

k. McCain

Regular battery and larger capacity ones for longer usage