I used the InReach SE last year and opted for the Recreation plan for my big 3 week mountain goat and elk hunt in Wyoming and didn't come close to using enough custom text messages to justify the price difference between the Recreation plan and the Safety plan.
I plan on just using the safety plan for the future and paying extra if I use more custom messages.
I used the heck out of the unlimited preset custom texts though. I had one that essentially said, "getting going this morning, hope this is the big day", one that said "just checking in, everything is going good", and one that said "back in camp, maybe tomorrow will be the day". Or something like that.
I think I only used 10 or 12 texts that I actually typed out even though I think the recreational plan gives you 30 or so. I didn't use the tracking points to save battery and also because I would send out the free unlimited "just checking in" text 2 or 3 times a day when I was changing locations, eating lunch, etc. so people could actually look and see where I was at several times a day if they cared to look.
I was very happy with the coverage, on my wilderness elk hunt my buddy had a SPOT satellite phone and had a heck of a time getting coverage in the river bottom, but I was able to send and receive text messages from inside the canvas tent. He gave up and had me send out some texts for him a couple times.
My 2 cents. Nathan