This is from one of my customers about coinbase.
"Coin base is really playing up, everytime I'm sending to an external address that isnt a coinbase addy is just saying pending. I get an email from them telling me its not being picked up by the network.. This is the second time now. They dont reply to my support tickets and its pretty worrying. Sorry for this."
and no Mt Gox doesn't work.
Given there is delays sometimes sending out I haven't had any issues with coinbase.
Some day's the cash outs are next day direct deposit to my bank account, how can you go wrong with that?