Looks like a great device for someone that wants simple SOS and canned messages only. For me, I really like my Inreach with the integrated on screen GPS and enough buttons to quickly compose text messages. Sure you can use your phone to do it, but with power sometimes a premium I like being able to depend solely on my Garmin. Also, now that Iridium has launched a good number of their next gen satellites I can definitely tell the difference in the speed and reliability of message delivery.
I have also built a custom application for myself that I can use to get all sorts of data from my Inreach such as more detailed weather, storm locations, weather warnings, river stages, forest fire updates, news, Twitter feeds, ISS flyover info, and even Wikipedia and Wolfram Alpha searches. It really makes the Inreach a much more valuable tool when hiking.