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No, not a warranty item at all. If you use the nav for POIs the update will help, but generally they are very dependent on exactly where you are whether it's really worth it or not.
Just curious, if you purchase from Sewell or eBay, do you still need a dealer to perform the actual update, or is it DIY?
It's a very easy install. There are 2 pins located in the tools for your spare tire. Use the pins to push into the holes in the clock display on the dash (highlighted in red) and pull back the display. There is a secret dvd slot located behind. Use the display to eject your map dvd and replace. Just like that!
That's to replace the nav DVD for '08-'09 running the Gen5 head unit. The Gen6 system is a USB I believe but since I've got an '08 this is how I do it.