I'm an Inreach Satellite Communicator for SmartPhone "classic" user. It has no fancy display, no touchscreen, just a couple of buttons and lights.
Owned it for 4 1/2 years (April 2012)
Important features:
1) replaceable batteries. 2x AA size, can use Alkaline, NiMH, or Liithium. I always use lithiums, and always have at least a few spare sets. My GPS also uses AA lithiums.
(I hike a lot in winter, and most rechargeables are very slow & inefficient to recharge in the cold. I can pop a new set of AAs in in a matter of about 15 seconds).
2) 3 pre-programmed messages: "OK". "Stopping for the night", "Delayed, but fine".
3) big fat buttons are easy to use, but the SOS button has a lock to prevent accidents.
4) can link to smartphone (bluetooth) for free-form 2-way messaging.
5) long battery life when not using tracking. The manual says 60 hours while tracking, but I recall a firmware update several years ago that improved the battery usage. So when I'm hiking, it always stays on.
6) REMOTELY LOCATABLE. If I haven't checked in in a while, and the spouse gets worried, they can hit a button on the web page, which sends a round-trip message so the device reports its location w/o any interaction from the user (as long as it is on -- but I always send a "stopping" before powering down).
Features I don't care about:
1) realtime tracking. Nope. Never turned it on or activated a subscription that includes it.
Costs:
"Safety" plan currently runs about $12/mo, includes unlimited pre-set messages, pay-per-use free-form text messages.
Observations in use:
1. It does take time to sync up with the satellites when you first turn it on. So just leave it on all the time. The first message may take a while to get out if it's been off for a long time. The status lights confirm message transmission (2-way communication is good...)
2. tree cover can affect how long it takes. Since I don't stare obsessively at the blinking lights, I have no quantification.
For the first 3 years, I never even owned a smartphone that could pair with it. But since then, I've found several occasions where I was in a cell dead-zone where it was Reeeallly useful to be able to turn on the phone, and send a text through the InReach. I now sometimes carry the cell-phone (off) when hiking.
No, I don't want this device combined with my GPS. And I don't want a non-replaceable, rechargeable battery, which is why I haven't "upgraded" to the newer models.