I tried this mixer and was waiting for 12h it to mix. And have to conclude that it is absolutely useless piece of crap. It's transacations are absolutely easily tracable. You can see that your transaction going to some address, than going to other, than going to your withdraw address. Yes, there are some other guys transactions, but they don't hide anything. Using the stupidest amount based analysis you can get the original bitcoin address.
whirlwind now will respond that it is designed to be so, that I should wait for more (more than 12 hours?), I should now withdraw all the sum (but parting will not help, I need all the btc go to the same finak address) etc. But perform mixing is your job here, not mine.
In fact the design of this mixer is extremely stupid, I strongly do not recommend using of it or take seriously.