Add me to the list of people with a bum left stick. I've had the controller for just a few days now and it went from a weird little hitch in rotation to a full-on rice crispies style sound and crunching feel.
On the first day I had it I set the analog curve to "instant" in Halo and the left stick drifted quite easily. It didn't do so outside of that setting so maybe that's a good early indicator?
I made a video on YouTube of the sound it makes if you are curious.
http://youtu.be/3XZew7r2WYo
I'm hoping this isn't a big issue. I'd love for my replacement to work for at least as long as my launch controller. It feels so damn good! If the replacement does this as well then I'm out until a revision.