Just wanted to add that I'm also experiencing QC issues with my case, before reading this thread I thought that it was an issue with my table but my 680x does teeter on the table unless I put a shim under it.
My biggest issue so far is that the PCIE slot screw holes do not align with the GPU holes. Multiple other posts I've seen have the same issue with this case. It means I need to add force to the back of the case in order to get the screws to line up, which puts unneeded pressure on my GPU / MOBO.
I tried to go the RMA route but they take at least 1 week for a response, so I'm not going to waste my time with an RMA. I've already purchased a brand new one from Newegg to see if it has the same issues. If not, I'm going to transfer my build into the new case. If yes, simply I'll return it to them. I personally would never buy anything directly from corsair, they aren't an experienced retailer when it comes to direct sales as evidenced by their poor customer support / RMA turnaround.