I've been to Soba a couple times now, and both times the food has been quite amazing.
I got a ramen dish last time that was amazingly spicy - in a good, sinus-clearing, make-you-think-about-what-you-just-done-boy sort of way.
The interior decor is quite beautiful and relaxing and swank. Presentation is quite nice too (well, soup can only get so pretty). I found the wait staff to be a little on the smug and unfriendly side, though. It isn't very clear how they separate the bar service from the seated tables, or where you're supposed to sit down, or how their whole system works. None of the staff seemed overly ambitious or excited to invite some new customers in.
I couldn't tell if they just are unhappy in their jobs or if they think they're top shit and should treat their clients like they don't belong, or what the deal was. Perhaps it was just one experience. I'll be back to try it again - because the food is worth it.