I got in on the InReach Explorer for about $330 18 months ago, glad to see that the price is dropping and allowing more people to jump on board.
When we travel we use the unlimited texting option (just much less stressful for me than trying to manage my allotment), and while we originally started out using it just for backup purposes (i.e. when we didn't have a cell phone connection), we pretty quickly moved to using it as our primary text communicator. It just worked everywhere, send and receive, with no worries about whether a cell tower was in sight.
We couple the (extremely inexpensive) SAR insurance and (a bit more expensive but still a good deal) global MEDIVAC coverage with the InReach. As others have said, you hope that you never need to push that button... but very nice to have it there. If SAR have to put themselves at risk due to a poor decision on my part, I feel better knowing that I have coverage to cover at least the costs of those efforts - and I feel good having a 2 way device that can point them directly to where I am.
As I get to know it, I find myself using the InReach more and more for hiking navigation, especially if I can use it in conjunction with my iPad before I start out to load in a few waypoints. If not, I just load in the trailhead as we leave.
Is the InReach perfect? No. An external antenna would be sweet, as would the ability to support multiple devices via bluetooth - but overall it is a solid product that has made our lives a little easier and gives me a little confidence that I can call for help if I get in a bad situation.
As a side note, Delorme has a booth at every expo (East and West) manned by capable and informed folks. Their ongoing presence is a good sign (to me) that they value the overland community and are committed to understanding and serving our needs as best they can.