I have the SE.
One complaint I have is that you can’t use any of the device’s functionality if it isn’t active. Mine is inactivate between trips (easy to do in Canada). Last week I re-subscribed on the website, left for a trip with the intention of activating the device via satellite but found out it wouldn’t activate once I was out there.  A few times on that trip I wanted my coordinates, which the device could easily have given me, but Delorme locks out the device if you’re not paying for messaging.
Turns out the website glitched and said my request to activate had gone through when it hadn’t. So everything turned out fine and I ended up saving money, but still the device should be usable for GPS, time, elevation etc. even when you’re not paying for messaging.
To address the top at hand, all I ever want is my coordinates to transfer to paper so I don’t have much interest in the SE. Once in a while the ability to make a waypoint is nice so I don’t have to jot coordinates on the map. If the SE could handle a few waypoints that would be nice.
The battery seems good while the unit is off. I turned the unit off mid-September and turned it back on this week (late Dec) and it was at 93%. So it loses about 2%/month while off which is pretty good.