Mine is bent slightly in the center, maybe 2 mm over half the length of the board, but I just received it and haven't had the chance to test it yet. It looks to be due to the thickness of the board. The board is just over half the thickness of the Raspberry Pi. I'm guessing this was done for cost savings, but could impact the functionality of the board in certain cases. It might also explain the rather large size compared to the relatively few components. Adding 2-4 extra layers would have allowed them to route the board into a much smaller size, but would have increased the price considerably.
Hopefully this will be resolved in future releases.
Hopefully this will be resolved in future releases.
