You could always wait a week to see what others say. But I'd definitely update sometime soon to avoid any legacy problems.Mine has always worked fine.
Do I have to up date?
I'm guessing power management, or fixing a bug that once in a great while caused a fob to go offline.I was wondering what this key update was before I install.
Keep in mind that it could be something not immediately obvious, like power management. My guess, however, is that it is somehow related to the 3.6.0 gravity update that made Fob recognition better.