I have to say I am quite frustrated at the moment. I made a withdrawal of 3 real BTCs from bitcoinbuilder.com to my wallet two days ago and they still haven't arrived. Support emails I've sent were not answered so far.
Keep us informed. Check out their FAQ too, it says to click on "recheck balances" or maybe you withdrew between 8pm-11pm PST so you have to wait for the next day.