We just got a used 2013 and we also love it. The battery disconnect is a big one....I was so excited not to have to completely unhook the battery after each trip...lesson learned.
I also second the bathroom heater - switched to a damper and it's been fine.
I often have a hard time figuring out the auto level (where it's supposed to remember where it came off the truck), so you might want to video that or write it down. Instructions to the level are inside the compartment door, so that's a bonus.
Only thing I'm finding taking time to get used to is the height - it's tall compared to our old 250rs, and it takes a bit to get past the fear that some bridge will pop up, or that you won't hit under a 13'8" bridge. I really wish they'd do lower profile air conditioners!