I signed up with Coinbase a few weeks ago.
I must say that the experience with that exchange is more than unsatisfactory! The limits imposed make it virtually impossible to make any gains in this booming crypto currency market. I since have have started trading with liviacoins.com, which has a speedy transaction process, thus allowing me to make trades commensurate with the level of funding I desire.
If you want to deal in pennies or get scammed, stay with Coinbase.