Upgrade to DVD Navigation Version 6.4?

I purchased my '05 Armada back in August and noticed that a new version of the DVD Navigation software (version 6.4) is now available from Zenrin (www.zenrin.com). The site is short on specifics other than that more of the country is now covered on the dvd and that the points of interest have been updated. For $190 (free shipping through Dec 31), you'd think they could give a few more details about the dvd. I live in an area where freeways that opened up this year do not yet show on the 6.3 dvd and so I'm only interested in the update if those kinds of omissions have been corrected. I really wish Nissan would throw in one free update since my vehicle isn't even 6 months old.

Anyone have any experience with the 6.4 version? Is it worth the money?