I’ve used a CPAP/APAP for almost five years with usually about 2 AHI with a prescription min/max of 4-9. I have used a ResMed S9 and S10 (with and without humidifiers) and a HMD Z1 (and have its battery pack). I very much like the S9; it's reliable and solid and quiet. The S10 on a short trial seemed noisier and bulkier. The S9’s and S10’s algorithm does tend to stay at upper limits, for good or bad, after you happen to hit apneas or hypopneas. After many trials, I (and my wife) tolerate the Z1 well but it is noisier than the S9. For me, both machines require you to carry too many things if you travel (even without humidifiers). The S9 with its cumbersome brick is quite heavy and has an easily damaged electrical connect. The nice but bulky S9 carrying case adds one more piece of luggage to any trip. For travel, the Z1, although very small, effectively requires not only the basic machine, but also a mandatory plastic insert between the machine and its tube, an optional Q Tube insert for quieter nights, and a heavy brick with cables on both ends. (The S9 provides really basic information on the machine’s own screen. The Z1 has never worked smoothly with my iPhone 7 iOS 10, even after long conversations with HMD’s friendly technical support staff.)
In light of these facts with the advent of new travel machines, I decided to buy either a ResMed Mini or a Respironics Go. I was dissuaded from the Mini, despite my familiarity with the ResMed algorithm, by its cumbersome HIE insert, its strict limitation to a few proprietary mask types, and, most important, the various (possibly accurate or inaccurate) reports of high tube noise levels. I was persuaded to purchase the Go by its thoughtful integration of all components into one elegant piece. The entire Go unit, about 2 inches in width in its taut travel case, and its simple (no brick) electrical cord and tube slip easily into my computer travel bag.
I now use the Go full time. So far, the Go itself seems to be an extremely flexible, extremely quiet device. The Go effortlessly provides to a smart phone more information than the S9 or Z1 on the Go screen or via its dedicated Blue Tooth app. (Your doctor (or you) very easily can alter the pressure limits once you know the Go’s simple medical entry protocol which can be found via this site.) The Go adjusts to use any manufacturer's various tube sizes, 12, 15, and 22, and comes with its excellent proprietary very light weight, very compact 12 mm tube. Unlike the Mini, the Go is compatible with any type of mask or nasal pillows. The Go unit appears to be very well built and has no elements that would snag (or get lost) in carry-on or checked luggage.
To my eye, the Go has the perfect, if somewhat pricey, proprietary Go battery solution. The very solid basic machine and the companion battery slide into each other to yield a fairly compact single unit. You can leave the add-on battery attached to the APAP or CPAP Go and, if power fails, the battery automatically starts. Alternatively you can charge the battery on the side and use it when you know you will not have an electrical outlet available. The battery will run the Go for about a dozen hours at moderate CPAP 10 levels. The Go currently does not have a humidifier but quite clearly has been designed for the addition at some future date.
My overall impression is that the Go’s designers were determined to avoid earlier travel CPAP issues and to make travel simple. At the moment, after two weeks of use, my perhaps too diligent research about alternatives appears to have yielded a really good solution for a person who wants a travel with an APAP or CPAP that also can be used full time at home. The current pricing for the APAP appears to be about $849 for the APAP and $799 for the CPAP and $299 for the battery pack.
Hope this helps a little.