I have a 2nd gen spot, and hav used it along side the Delorme Inreach for 2 years now.
They both track well, I suggest the spot plan that does not have the automatic tracking option.... No real advantage to it.
The Delorme capability to send short texts (160 characters) is nice, but I would not have a delorme as my tracking device. It EATS batteries! Both units require use of lithium batteries, and if you cheat with normal batteries you get a very very short battery
life (measured in hours).
My spot has been on for 3 weeks currently... O the same batteries. When I am underway I hit "ok" once ever couple hours or on passages at watch changes.
The delorme has gone through 5 or 6 sets of batteries in the same time. I did the suggested software
update which helped a little, and I changed the tracking frequency to 1 hour from the default 15minutes.... Neither have helped.
If you go with the delorme, bring lots of batteries! Keep in mind that you are going to pay 2 - 3x as much for the lithium that it requires.
One person here suggested that the delorme will run when powered by the USB plug
under the batter compartment. I have tried this with a few different adapters and they light the "red light" on the power button,,,, this results in either limited transmit or failure to transmit position data.