Whoever hates on this ski is a fool, and I don't say that too often about a K2. Ski actually kills it, stiff, supportive, snappy, lightweight (well, for a K2), durability is never an issue with one of their products, all said, killer choice. My only beef, it's next to impossible to sell with the terrible fucking graphic it has, so if you can get past that (some people can, some can't, some like it, and I think they're weird), you'll be in for a kickass ski.
And 179. The rocker makes it ski a bit shorter, on top of the twin feeling shorter, and mounting it forward (I'd go -2 cm, but thats just me) will make it feel really short. All said, the 169 would feel like a skiblade to you.