Coinbase does not give you proper notice when they change your wallet address.  Be very careful.  when they do this, there is no warning.  you could be in the middle of receiving bitcoins and when they change the address in the process, the sent coins can go to your old address after they give you a new address.  the coins are lost forever when that happens. 

they won't help you at all.  I am actually suing them in small claims court in Washington State. they just obviously take the coins and tell you they are "lost"

don't use coinbase.