yes because the superfly headset is very low; it comes setup like a race bike (even though I don't believe that's and advantage) with a 105 stem. my HB's were 2" below my saddle, I prefer 1". The stock bar is flat. there is no room for a spacer. right now I have a 80mm stem but may go to a 70. Its what I like. Plus the carbon is a bonus. My seat height BTW is 43"!
trail conditions are really dry; lots of moon dust in the exposed trails, firm and flowy in the trees. there are some roots and rocks, a few sections of short switchback sections with large rocks and loose stuff, with the 9'r, you just get way back and low and work the front brake and roll through. I am still working on those skills. but I am already taking tight switchbacks much faster and the climbing is much easier.
One thing I did not expect was how good this new generation of avid elixir's are. i have the 1's but they have been really good so and they aren't even squeaking! fairly good modulation; not as good as the XT's but I will keep them until they get grabby and squeaky.