Does anyone know the difference between these two feature sets/apps? Is one older and the other newer? It sounds like the 2015 GS is supported on either? Any info would be appreciated. Also, are they worth the annual subscription?

So, I came from a '14 GX that had RES+. Now I have a GS with Enform. RES+ was the older remote start system before Lexus consolidated everything into Enform remote. I think it was a factory option instead of port installed and costs around $800 plus subscription of around $100/year. RES+ was not as reliable (I found) because it used 2G GPRS cellular service. That has been phased out and Lexus upgraded my older ECU (under warranty) to 3G as it stopped working when AT&T shut down the system.

As for comparison, Enform remote gives you much more telemetry than I had with RES+. With RES+ I could tell if all doors were locked or unlocked and start the truck. It would give me temperature at the car based on GPS data and also locate it using the same. It would also alert me if the alarm was engaged. That is about it. With Enform remote I can see what doors are open/locked/unlocked, get alarms when anything is opened on the car, see distance to empty based on how much gas is left, see odometer info and activate a guest driver for the car with parameters. Enform remote is far and away more advanced than RES+.

I like it and will probably continue the subscription after the free period ends.

I got 3 years free after a long standing dispute with my dealership. I love Enform and the notifications. I will continue when my sub ends.