I go on lots of solo backcountry ski outings in the high Rockies. My main item of safety gear is a brain experienced in these matters. This brain is backed up by the SE. After eight months of use, I have a good working relationship with the device. Setting out, I send a Preset message to some friends and relations who care about me, which says I'm setting out. On return, I send the second Preset message to the same people, which says I've returned. If I decide to do something about which I have any significant doubt (this is pretty rare), I send the third Preset message, which says I'm about to do something "interesting". All inReach messages automatically include geo-coords. If any of my minders question my welfare, they can ping me or send me a message. So far, this hasn't been necessary. They confirm, though, that they are getting all the messages I send.
Usually I turn on tracking. For a while, I was not using the tracking function, and I noticed that the times shown for the messages sent had the day of week and time of day but not the date. Then, when I sent a tracking point, the complete time information suddenly appeared for all the messages. Weird software glitch.
I have also been pairing the SE with an iPod Touch for mapping. I much prefer using Gaia over DeLorme's Earthmate. I download the USGS topos and aerial photos for the region I'm in. The display is super-good. This beats paper maps all to heck. There are drawbacks, however. The iPod needs to be kept reasonably warm, so I keep it in a pants pocket when not using it. Also, it's called iPod Touch because it has a touch screen, and that requires bare and warm fingers. In very cold weather a touch screen is not so wonderful. The SE's four-way rocker and buttons can be operated with gloves on. The SE has functioned fully in sub-zero weather while tethered in an upper pouch on my backpack.
A day's skiing usually draws down the SE's battery to 94%, and that's with Bluetooth pairing. The iPod doesn't show percent battery, but normally it looks like no more than ten percent or so is used. Battery use depends mostly on how long the display is on. I keep it fully bright because there's a lot of daylight out there in the snow.