Well I will also vouch for the fact that there are many absolute ******* on fg.
In amsterdam I used to always see sweeeeeet fixies moving slower than mothers carrying 3 children in a cristiania bike. I imagine those guys do stay far the hell away from hills.
What gearing do you run? and have you ridden fixed much at all? I just started riding fixed again after like a year off and my legs are no longer used to it at all. I can still ride it just fine but after my legs get really sore. This didn't used to happen back when I rode fixed all the time.