Just something to consider, but Garmin inReach, any of them, use the Iridium satellite service.
With that being said, I currently use Spot X, which uses Globalstar, and have only had one or two problems. I have been thinking of switching to a Garmin unit as I like some of the functionality that they offer.
For those of you having issues with the inReach line, can you provide the model that you are using?
Buckle up for a long post from me
I would love to have an actual Sat Phone (Maybe when I'm independently wealthy) but for my needs the inReach has been great and turned out to be an invaluable piece of kit for my travels. There is noting more frustrating than when our expensive devices don't work as intended, and I completely understand loosing faith in the platform of a specific manufacturer or device.
Looking back in this thread I see the OP has a SE+, and another person had the Explorer+ - both of those units were released after Garmin bought inReach and replaced the older SE and Explorer models. Basically the SE does not have maps while the Explorer has maps (screen too small to be really useful).
All communication/navigation devices can fail much like our vehicles. Even a paper map can fail if it gets ripped or something. Why they fail is sometimes unknown and can be due to many different reasons making it hard to troubleshoot. Failure because "Garmin Sucks" isn't a reason and makes it impossible to diagnose.
Failure to update is a problem, but without being there and being able to troubleshoot doesn't give me enough information to form an educated decision on a units reliability.
I would guess that there are literally thousands of these devices in the field working without issue is that they have a high success rate compared to the failure rate.
Failure to send and or receive messages or having long delays is also almost impossible to diagnose without being there. Too many factors involved. Was it the senders device? Was it my device? Did the unit just fail? Did the sender turn their unit off before it sent? Did my unit get turned off before it sent? I've had messages deliver weeks or months after they were sent, but I know that I had turned mine off before the original message was sent to me so I received it when I turned mine back on.
I have the much older SE which is a legacy inReach device without any maps. Bought it used on eb*y. I've run it for countless days and hours in tracking mode for weeks at a time in the US and Baja. It's been dropped, banged up, crashed with, and it has failed once. It shut off on a long remote leg in Baja and I didn't know until I got to my destination. I thought it was dead, but a web search I found how to do a hard reboot and it has worked flawlessly since then. I noticed the newer units (Still legacy inReach) have the hard reboot button sequence printed on the unit when I compared with other ones in my group. My unit is so beat up that all the writing on the back has been worn off. When I got it working again I received all the messages that had been sent while it was down. The messages were for help for a disabled motorcycle in our group. We had secondary communication devices aka Ham Radios so we were able to coordinate the recovery but that's another story for another thread.
When my inReach failed it was in my cargo pocket on my pants while on my motorcycle. I've since stopped carrying it there on superstition. Maybe that down low location made it overheat and turn off, who knows.
I've had a few spot devices that just stopped working completely without warning (once at the beginning of a long road trip) Spot customer support was great in helping diagnose the issue and confirming that the units were dead. Once I think it overheated by leaving in my tank bag in the map case with clear plastic window, and again failed during a trip. Super frustrating, but not the actual reason that I switched to inReach. I switched for the two way communication.
I've hammered on the inReach in a few situations in Mexico sending messages back and forth for hours coordinating and injured rider extraction and coordinating our large group of riders who were spread out over different areas on a few different occasions. I went 23 messages over my subscription and I think it cost me all of $13 extra (well worth it).
The time the inReach really paid off in Baja:
Rider broke both his tibia and fibula just before sunset several miles from pavement near the tip of the Bay of Conception south of us in Mulege. Thankfully we had a van with our group and we scrambled immediately to get the rider and transport to a hospital. We had a major flurry of messaging going back and forth between inReach devices for our injured rider who was over 50 miles away and it was at night in Baja. We were sending medical instructions via the Nurse who was with us and getting valuable information about the rider. We had multiple updates on location using KM markers to meet them in our van and then transport him an additional 90 miles to a hospital all at night in Baja. It was pitch dark with no street lighting in remote highway areas, but I was able to easily find our injured rider using a mix of messages and the location info from them with my GPS and the inReach application on my phone. I can't imagine how long it would have taken without these devices. I won't leave home without mine. The whole story is for a different thread, but it was a major event in my travels to say the least and cemented my faith in these units and overall in teamwork.
One of the biggest issues I've found is not being familiar with the device and its limitations, and our own unrealistic expectations. I have this problem with my Ham radios and other devices that I don't use frequently enough. Before I go on any trip I make sure I get reacquainted with my devices to avoid issues. When in groups I strongly advise other members to get familiar with their devices and have had lots of issues with people being frustrated with them because when the time comes to use them in a hurry they are not prepared. I like to run tests with them to make sure they are working before the trip and I insist on this with groups.
Chance favors the prepared..