Some people have reported delays with Bitcoin withdrawals, but my experience has been that 9 times out of 10 there is no delay.

Also, to say there's a delay getting out USD is a bit of an understatement.  It's pretty much impossible to withdraw USD from Gox at the moment.  If you are in the EU, SEPA transfers are possible but slow.  If you are in Japan, then you are in luck as the word is that JPY transfers work just fine.