Any reason to update my iPhone 4 to iOS6?

I like my iPhone4, and its battery life is still great so far. Is it worth it to update to iOS6 at this point?

My case against it so far: No SIRI, no panorama, no turn-by-turn, losing Google maps. Ie. I don't get any of the benefits of iOS6, at least the advertised ones.

I've heard some anecdotal comments about iOS6 actually improving performance, but I doubt it.

What do you guys think? Any iPhone 4 users updated theirs to iOS6?