We just ate at N9ne; we had been looking forward to it for a while, and weren't really put off by the reports of noise and overly casual service. The restaurant was a real disappointment, though. We liked the service just fine (yes, it was very young and very casual, but plenty attentive and knowledgeable), but the food was a major disappointment. Good but not top-drawer quality, and the chef is really mediocre. Most of what came out of the kitchen was unimaginative or cloying.
Looking foward to Craftsteak on the next trip, though.