Just took my new 2009 Heli pro 16L pack to Sugar Bowl yesterday and.. it's comfy as hell. I thought I wouldn't like the bag due to discomfort, extra weight etc. But I actually prefer having it and will be riding with it for now on. I also bought a camel pack hydration system from Big 5 and it works perfectly.
2 things though.. I think the smaller pocket should include pockets within the pocket (if that makes sense) as it is right now, there's only 2 "real" pockets. 1 big main one and a smaller one (Shovel pocket). Of course there's the water bottle pocket, but it only will hold really small things and the waist strap (I only put my keys in it, if I put my keys and phone, it's really uncomfortable).
Also, I got stuck in powder and the front pocket had some water seepage. Small, but it was noticeable. Other than that.. I think it's a quality pack. And for $45 bucks on Sierra.. I think it's a steal.