Myself and a buddy both have them and used them last summer on tuna trips. He's got the newer version with the screen, I have the older one that's essentially a little box with a couple buttons. Both sync with your smartphone so I saved some $$ going with the older model. Works great texting as well as for tracking purposes offshore.
You can setup your own delorme tracking site that is password protected then send the link and PW to any buddies you might network with. I've been out on a decent bite and sent the numbers to friends that haven't left the dock yet.
Obviously it's also nice to be able to let those at home know if you're running late, etc.
You can suspend service in the offseason and then pick up where you left off when the water shows up.
I have a small boat and only run limited offshore trips so it's a decent alternative to a sat phone for me.