I don't have any rattle when moving through the gears but I do have the noise at idle in neutral with the clutch engaged. As soon as the pedal is pressed it fades out, most definitely sounds like an input shaft bearing. Took it to the dealership twice and they told me nothing is wrong. The second time they said they replaced some bearings but I don't think they did anything to it. They didn't even give me any warranty paperwork when I picked it up so pretty sure they just let it sit for a week and told me they worked on it to make me feel better. Between the trans noise and the horrible brake squeaking when cruising along (which momentarily goes away when you press the brake pedal but then comes back) I am driving around in a $45K car that sounds broken as crap. Thanks GM...will just drive the crap out of it until it breaks and I am stranded on the side of the road...
