I like my navi. I'm still getting it all set up to read the files right and give me the most pertinent data so I can enjoy the music with the least amount of effort.
As far as the actual navigation, it's really sped up in the last 3 years. I had an accord where it took quite a bit longer to re-calc if you missed a turn.
One disadvantage, which really applies to this thread is that I don't believe you can use the in-line video inputs since the DVD drive for the navigation disc is no longer in the trunk.
Short answer: I'd get it