I'm riding a small TracerT275C, but i'm 5'2". The bike has a roomy cockpit though so you'd probably enjoy the small. I took a spin on my buddies medium S-works Enduro 26 and except for the standover height everything felt similar length wise. Another buddy with a medium Felt jumped on my bike last weekend and commented that it more comfortable than he expected for a small.
I demo'd a small and ordered one, but I haven't got it yet. I'm 5'7". I debated the medium, but historically I've liked my bikes small and I didn't get to try the medium. Based on the numbers I'm confident I could fit either size, but it was more of a question of which I would like better.
5'6" - medium was the better fit for me. I had a small for a few months and could ride it just fine but felt i was always on the "front" of the bike.
The Med with a 50 or 55mm stem is dead on for me.
I think the more aggressive a rider you are might determine it for you, as the small got a little dicey at speed. Awesome bike though.
I wish the head tube was bit shorter on the med...
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